MPLS L3VPN BGP AS number

Hello

I use "Cisco IOS Cookbook" from O'Reilly.

In his example, MPLS L3VPN, it assigns 'BGP 100' (a public number) for routers in the MPLS cloud and private AS numbers to routers of THIS.

I want to follow this example for readability in a real project, but I was wondering if I should use a private AS number instead. (for PE routers.)

Our Organization is not a public number yet. Even if we have, I think that we will have a new router dedicated to public internet EXCHANGE.

So I'll be fine if I use 'BGP 100' on our PE routers?

Thank you

-Andrew

Andrew,

I'm curious to know what kind of example you follow, but I can say this, to the same ASN BGP sessions are considered the iBGP connections, connections to an another BGP ASN BGP will be considered eBGP connection. So if you have a 'true' ASN assigned you will have likely to reconfigure you iBGP connections. There may be a workaround as the "local" solution - as

ASN100 really exists on the internet, so I advise against the use of 100.

-Tim

Tags: Cisco Support

Similar Questions

MPLS BGP route push DMVPN rays

I have an MPLS with BGP. I have sites that are not connected directly to the SPLM, also, but need a VPN s2s hub sites that are connected to the SPLM and in this way they access resources MPLS. I need to communicate the changes to itinerary for the SPLM when the DMVPN fails on another hub.

Currently, this is my config:

Datacenter (MPLS only)
```
 interface GigabitEthernet0/1 description MPLS ip address 192.168.0.34 255.255.255.252 interface Vlan2 ip address 192.168.96.2 255.255.255.0 router bgp 65511 bgp log-neighbor-changes network 192.168.96.0 neighbor 192.168.0.33 remote-as 65510
```
Hub site 1 (MPLS + internet)
```
 interface Tunnel200 ip address 10.99.99.1 255.255.255.0 no ip redirects ip mtu 1400 ip nhrp authentication auth ip nhrp map multicast dynamic ip nhrp network-id 12345 ip nhrp holdtime 600 tunnel source GigabitEthernet0/0 tunnel mode gre multipoint tunnel key 200 tunnel protection ipsec profile dmvpn interface GigabitEthernet0/1 description MPLS ip address 192.168.1.2 255.255.255.0 secondary ip address 192.168.0.2 255.255.255.252 router bgp 65001 bgp log-neighbor-changes network 192.168.1.0 network 192.168.21.0 !10.99 clients are DMVPN spokes neighbor 10.99.99.3 remote-as 99010 neighbor 10.99.99.3 route-reflector-client neighbor 10.99.99.21 remote-as 99001 neighbor 10.99.99.21 route-reflector-client !as 65000 is the MPLS PE neighbor 192.168.0.1 remote-as 65000
```
Hub 2 site, has the same configuration, except for the local ip address and the router BGP ID.

Spoke site:
```
 interface Tunnel200 ip address 10.99.99.3 255.255.255.0 no ip redirects ip mtu 1400 ip nhrp authentication auth ip nhrp map 10.99.99.1 PUBLIC_IP_HUB_1 ip nhrp map 10.99.99.16 PUBLIC_IP_HUB_2 ip nhrp network-id 12345 ip nhrp holdtime 600 ip nhrp nhs 10.99.99.1 priority 1 ip nhrp nhs 10.99.99.16 priority 5 ip nhrp nhs fallback 60 tunnel source GigabitEthernet0/0 tunnel mode gre multipoint tunnel key 200 tunnel protection ipsec profile dmvpn interface GigabitEthernet0/1 description Internal ip address 192.168.3.1 255.255.255.192 router bgp 99010 bgp log-neighbor-changes network 192.168.3.0 neighbor 10.99.99.1 remote-as 65001 neighbor 10.99.99.16 remote-as 65013
```
This site speaks
```
 #sh ip route B 192.168.1.0/24 [20/0] via 10.99.99.1, 00:47:01
```
which is the network of HUBS, but the rest of the MPLS roads are not "learned".

What Miss me?

Thank you!

192.168.21.0 is another spoke, sorry for Terseco not that. Same configuration as the op 192.168.3.0. So I make a record of the domain controller and it will the first hub and not backup

The difference is that your hubs are advertising the subnet 192.168.21.0/24 IE. you have configured it as a statement of network under your BGP configuration on the hubs and not the rays where this subnet is actually which brings me to my next point.

The hub will switch to backup when I mannualy closed the internet interface, but not the entire router. This could be a problem?

Yes because the Hub 1 site still has its MPLS connection until 192.168.21.0/24 advertising to the domain controller is.

If this subnet was announced by speak it that it belonged and not the hubs then it should be announced only by hub site 2 because the Hub 1 site is more would receive it on the site talks about.

So why are advertising a route speaks on hubs instead of reception by spoke them and transmit to the MPLS network?

Edit - for this subnet to advertise you must have a route in the IP routing for her table. How are getting you this route in the routing table, it with a route static and if yes, what is the exact route you entered?

Jon

Questions about N3024 switch by default - originate BGP

Here is the configuration of the two switches. I set up and rising BGP, passing of prefixes. I want 1 switch to send a default gateway to switch 2 and have the default installation of command on the next statement are created. I don't see the 0.0.0.0 route by default in the show ip bgp sum command, but which is detailed in the configuration guide. However, I don't see a default route 0.0.0.0 in the routing table for switch 2 at all and an error message that there is no default route available. Would I be missing here?

Config is below:

SWITCH 1

Configure

VLAN 50

output

VLAN 50

name "switchtest".

output

hostname "Switch_1.

location 1/0 1! Dell network N3024

battery

1 1 member! N3024

output

IP routing

!

loopback interface 1

IP 10.0.0.1 address 255.255.255.255

IP ospf area 0

output

interface vlan 1

DHCP IP address

output

interface vlan 50

172.16.0.1 IP address 255.255.255.252

IP ospf area 0

output

router ospf

router ID 10.0.0.1

10.0.0.1 network 255.255.255.255 area 0

network 172.16.0.0 255.255.255.252 area 0

output

!

item in gi1/0/1 interface

Description 'Switch '.

switchport access vlan 50

output

Server SNMP engineid local 800002a203f8b1566f36c4

router bgp 65001

router BGP 10.0.0.1 ID

172.168.0.0 netmask 255.255.255.252

10.0.0.1 netmask 255.255.255.255

172.16.0.2 neighbor remote - as 65002

neighbor 172.16.0.2 are created by default

output

output

Switch_1 #show ip bgp

BGP table version is 7, local router ID is 10.0.0.1

Status codes: s removed, * valid, > best, i - internal

Source codes: i - IGP, e - EGP? -incomplete

Network Next Hop metric LocPref path origin

------------------- ---------------- ---------- ---------- ------------- ------

* > 172.16.0.0/30 172.16.0.2 1 100 65002 I

* > 192.168.100.0/30 172.16.0.2 1 100 65002 I

* > I have 10.0.0.1/32 0.0.0.0 1 100 I

* > 10.0.0.2/32 172.16.0.2 1 100 65002 I

Switch_1 #show ip bgp sum

IPv4 routing... Enable

BGP Admin Mode... Enable

BGP router ID... 10.0.0.1

Local AS number... 65001

Traps ......................................... Disable

Maximum paths... 1

Maximum paths IBGP... 1

Default Keep Alive Time... 30

Default hold time... 90

Number of entries of network... 4

Number of PATHS... 1

Default metric... Not configured

Advertise default route... NO.

Redistribution:

Dist metric list of source route map

--------- ---------- -------------------------------- --------------------------------

Neighbor ASN MsgRcvd MsgSent State down time Pfx Rcvd

---------------- ----- -------- -------- ------------- -------------- ---------

172.16.0.2 65002 78 82 ESTABLISHED 0:00:23:24 3

Switch_1 #show ip route

The traffic code: R - RIP derived, O - OSPF derived, C - connected, S - static

B - Derived E - from outside, AI - BGP OSPF Inter zone

E1 - OSPF external Type 1, E2 - OSPF external Type 2

N1 - OSPF NSSA external Type 1, N2 - OSPF NSSA external Type 2

S U - unnumbered Peer, L - flight road

* Indicates the best route (the lowest metric) for the subnet.

No default gateway is configured.

*10.0.0.1/32 C [0/1] directly connected, Lo1

B *10.0.0.2/32 [20/1] via 172.16.0.2, Vl50

10.0.0.2/32 [110/11] via 172.16.0.2, Vl50

*172.16.0.0/30 C [0/1] directly connected, Vl50

B 172.16.0.0/30 [20/1] via 172.16.0.2, Vl50

B *192.168.100.0/30 [20/1] via 172.16.0.2, Vl50

192.168.100.0/30 [110/20] through 172.16.0.2, Vl50

SWITCH 2

Configure

VLAN 50 100

output

VLAN 50

name "SwitchTest".

output

VLAN 100

name of the 'Switch '.

output

hostname "Switch_2".

location 1/0 2. Dell network N3024F

battery

1 2 Member! N3024F

output

IP routing

!

loopback interface 0

output

!

loopback interface 1

10.0.0.2 IP address 255.255.255.255

output

interface vlan 1

DHCP IP address

output

interface vlan 50

IP 172.16.0.2 255.255.255.252

IP ospf area 0

output

interface vlan 100

IP 192.168.100.1 255.255.255.252

output

router ospf

router ID 10.0.0.2

10.0.0.2 network 255.255.255.255 area 0

network 172.16.0.0 255.255.255.252 area 0

network 192.168.100.0 255.255.255.252 area 0

output

!

interface item in gi1/0/23

switchport access vlan 100

output

!

interface item in gi1/0/24

Description 'Switch '.

switchport access vlan 50

output

Server SNMP engineid local 800002a203f8b156530097

router bgp 65002

router BGP 10.0.0.2 ID

172.16.0.0 netmask 255.255.255.252

192.168.100.0 netmask 255.255.255.252

10.0.0.2 netmask 255.255.255.255

neighbor remote - as 65001 172.16.0.1

output

output

Switch_2 #show ip bgp

Version of BGP table is 9, local router ID is 10.0.0.2

Status codes: s removed, * valid, > best, i - internal

Source codes: i - IGP, e - EGP? -incomplete

Network Next Hop metric LocPref path origin

------------------- ---------------- ---------- ---------- ------------- ------

* > I have 172.16.0.0/30 0.0.0.0 1 100 I

* > I have 192.168.100.0/30 0.0.0.0 1 100 I

* > 10.0.0.1/32 172.16.0.1 1 100 65001 I

* > I have 10.0.0.2/32 0.0.0.0 1 100 I

Switch_2 #show ip bgp sum

IPv4 routing... Enable

BGP Admin Mode... Enable

BGP router ID... 10.0.0.2

Local AS number... 65002

Traps ......................................... Disable

Maximum paths... 1

Maximum paths IBGP... 1

Default Keep Alive Time... 30

Default hold time... 90

Number of entries of network... 4

Number of PATHS... 1

Default metric... Not configured

Advertise default route... NO.

Redistribution:

Dist metric list of source route map

--------- ---------- -------------------------------- --------------------------------

Neighbor ASN MsgRcvd MsgSent State down time Pfx Rcvd

---------------- ----- -------- -------- ------------- -------------- ---------

172.16.0.1 65001 83 82 ESTABLISHED 0:00:24:32 1

Switch_2 #show ip route

The traffic code: R - RIP derived, O - OSPF derived, C - connected, S - static

B - Derived E - from outside, AI - BGP OSPF Inter zone

E1 - OSPF external Type 1, E2 - OSPF external Type 2

N1 - OSPF NSSA external Type 1, N2 - OSPF NSSA external Type 2

S U - unnumbered Peer, L - flight road

* Indicates the best route (the lowest metric) for the subnet.

No default gateway is configured.

B *10.0.0.1/32 [20/1] via 172.16.0.1, Vl50

10.0.0.1/32 [110/11] via 172.16.0.1, Vl50

*10.0.0.2/32 C [0/1] directly connected, Lo1

*172.16.0.0/30 C [0/1] directly connected, Vl50

*192.168.100.0/30 C [0/1] directly connected, Vl100

Switch_2 #show ip route 0.0.0.0

The traffic code: R - RIP derived, O - OSPF derived, C - connected, S - static

B - Derived E - from outside, AI - BGP OSPF Inter zone

E1 - OSPF external Type 1, E2 - OSPF external Type 2

N1 - OSPF NSSA external Type 1, N2 - OSPF NSSA external Type 2

S U - unnumbered Peer, L - flight road

* Indicates the best route (the lowest metric) for the subnet.

No default gateway is configured.

No route found.

Solution:

Dell switches need to be turned on in the config.

router bgp * AS number *.

default-information originate always

BGP MPLS ATT

I'm having a problem with a circuit ATT MPLS Ethernet with BGP. I have a 140 circuit with ATT MPLS network and this is the only site where I will have this type of problem.

RECS to the CPE BGP to Rabat and the circuit goes up and down. Finally the circuit will remain difficult. I see at the bottom of my router. ATT tests the circuit and say they are testing their equipment clean. If I go in my equipment and close the physical interface that connects to the ATT equipment the port constantly monte to the TOP and BGP is restored without any problem.

* 26 sep 23:37:36.319: % LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state down

* 26 sep 23:37:37.319: % LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed State to down

* 26 sep 23:37:51.319: % LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed State to

* 26 sep 23:37:52.319: % LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed State to

* 26 sep 23:37:53.195: % ADJCHANGE-5-BGP: neighbor 172.X.X.X Up

* 26 sep 23:40:07.319: % LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state down

* 26 sep 23:40:08.319: % LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed State to down

* 26 sep 23:40:08.319: % NBR_RESET-5-BGP: neighbor 172.X.X.X reset (flap Interface)

* 26 sep 23:40:08.339: % ADJCHANGE-5-BGP: neighbor 172.X.X.X down the flap of the Interface

* 26 sep 23:40:08.339: % BGP_SESSION-5-ADJCHANGE: 172.X.X.X a unicast IPv4 topology neighbor base removed from Rabat Interface session

* 26 sep 23:45:20.319: % LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed State to

* 26 sep 23:45:21.319: % LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed State to

* 26 sep 23:45:22.527: % ADJCHANGE-5-BGP: neighbor 172.X.X.X Up

* 26 sep 23:46:53.319: % LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state down

* 26 sep 23:46:54.319: % LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed State to down

* 26 sep 23:46:54.319: % NBR_RESET-5-BGP: neighbor 172.X.X.X reset (flap Interface)

* 26 sep 23:46:54.339: % ADJCHANGE-5-BGP: neighbor 172.X.X.X down the flap of the Interface

* 26 sep 23:46:54.339: % BGP_SESSION-5-ADJCHANGE: 172.X.X.X a unicast IPv4 topology neighbor base removed from Rabat Interface session

* 26 sep 23:46:56.319: % LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed State to

* 26 sep 23:46:59.319: % LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed State to down

* 27 sep 00:01:16.319: % LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed State to

* 27 sep 00:01:17.319: % LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed State to

* 27 sep 00:01:24.171: % ADJCHANGE-5-BGP: neighbor 172.X.X.X Up

* 27 sep 00:02:18.319: % LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state down

* 27 sep 00:02:19.319: % LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed State to down

* 27 sep 00:02:19.319: % NBR_RESET-5-BGP: neighbor 172.X.X.X reset (flap Interface)

* 27 sep 00:02:19.339: % ADJCHANGE-5-BGP: neighbor 172.X.X.X down the flap of the Interface

* 27 sep 00:02:19.339: % BGP_SESSION-5-ADJCHANGE: 172.X.X.X a unicast IPv4 topology neighbor base removed from Rabat Interface session

* 27 sep 00:10:11.971: % LINK-5-CHANGED: Interface GigabitEthernet0/1, changed state down administratively

* 27 sep 00:10:16.963: % LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed State to down

* 27 sep 00:10:20.319: % LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed State to

* 27 sep 00:10:21.319: % LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed State to

* 27 sep 00:10:23.911: % ADJCHANGE-5-BGP: neighbor 172.X.X.X Up

Hello

Looking at this exit there is certainly a problem of layer 1 over there if its wiring or connection mux fault t, 9/10 its side ISP but you will likely replace the local wiring to keep out them

carrier lost 13, 0 no carrier, 0 break out

carrier and no carrier has lost the carrier is an electrical signal that use Ethernet devices to detect if the wire is being used by an another transmitting station.

The carrier lost counter increases whenever there is a loss of sense of the carrier. This occurs when the material emits a frame on the wire and does not see its own carrier wave on the Ethernet. The absence of the carrier signal increments the counter by any carrier.

carrier lost

Description: Cisco IOS sh interface meter. The number of times that the carrier was lost in the transmission. Common causes: find a bad cable. Check the physical connection on both sides.

IOS XR MPLS VPN L3 + BGP error message

I use the file "iosxrv-k9-demo - 5.1.2" image on GNS3 for free practice.

When my IOS XR with MPLS L3 VPN router and assigning an interface of IOS XR to a VRF, it gives an error:

RP/0/0 / CPU0:Feb 19 20:16:50.182: bgp [1048]: ROUTING-BGP-3-RPC_SET_ERROR %: [22]: read all RPC operation: Table. Error: ' Subsystem (3373) "detected the status of 'fatal', 'Code (37)': pkg/bin/PMO: (PID = 663826):-traceback = b395988 b229e9c 8226a4b 8224bdc afb2e7c b22d857 8267050.

looking for a solution.

Hi umesh, there is a table operation handler problem that has been fixed in xr 513. When the list is empty, it returns "error", but which is not necessary to return the error, an empty list can be ok, so the sw fix that went in is to check that and return errors more detailed codes inside the s in this case table operations and PMO communition XR (which is made via RPC or remote call procedure).

few options who may be here to try:

-1 ignore it and continue the configuration

-2 set all definitions of vrf first under router bgp and everywhere where necessary before you assign it to an interface

-3 clear config, reboot, apply the new configuration step by step with the first definitions of vrf and last to apply to the interface.

-4 Download xr513 XRv.

see you soon

Xander

BGP-advertising

Dear all,

I have a simple test facility. with MPLS and L3vpn top. I want to the CE router to not see the FAI AS in roads announce another CE router in vrf even connected to another PE router

How can I block the public from the ISP to the advertising in the BGP updates for routers of THIS. The CE router should see from the other CE router.

Topology is attached. I want to CPE-1 see only AS 1 in the PMO and not AS4000 update as

AS-path path

4000 1 4.4.4.4/32

but I want to hide AS 4000 so something like this

1 1 4.4.4.4/32

Hello - if it's a laboratory facility I would suggest a test using the NEIGHBORHOOD LOCAL-AS. This must be configured in router ISP PE-2.

PE2(config-t) x.x. #neighbor. x.x local-2

Please let me know if it works. Thank you

Best regards / SAIRAM

BGP configuration

Hi all

Please can someone help me understand this concept...

Let me show you the scenario

a single MPLS of ISP connection come to my router and my router in the DMZ servers

I have to connect to the remote server to my server DMZ

The ISP gave me the details of BGP configure

now what do I Route my private network for remote servers...

I run NAT on my router to go through the ISP connection... now I can ping to the gateway of the ISP and can see all the router in table bgp #sh

is this correct or I need to directly transfer traffic from the internal network of ISP through BGP... or

Do I have to create Tunnels... If the Tunnels are necessary then I need to know the remote desktop

Thank you very much in advance

You have 1 site that has a circuit of mpls and the other doesn't, or go in the same provider and SPLM on both sides? If you have mpls on both sides by the same provider, it should be as easy as peering with the supplier with bgp on both sides and advertising then your internal subnets. If you have the public internet between you, you will need tunnels of lan-to-lan creat between two routers. Here is a guide to help you to do:

http://www.Cisco.com/en/us/Tech/tk583/TK372/technologies_configuration_example09186a0080094634.shtml

HTH,
John

Please note all useful messages *.

DMVPN BGP and EIGRP

I am in the initial phase of research DMVPN. We currently have an MPLS network running BGP. Each site has Internet at home as well as a VPN site-to-site is built on the router and talks to an ASA when the SPLM fails.

I want to implement DMVPN to do away with the site to site VPN and ASA. I'm going to run EIGRP on routers to connect DMVPN. Are there any good whitepapers on BGP as the main path and by EIGRP on the DMVPN as a backup? Or no focus on a general config?

Thank you

It's really the main issue.

With your configuration DMVPN roads will be internal EIGRP of an advertisement of 90, so your default DC prefer DMVPN on MPLS, which is exactly what you don't want.

There are several ways around this as summarizing through DMPVN, redistribution connected on the sites of the branch in EIGRP so roads DMVPN are external as well and then changing measures etc.

The other alternative I have ever done so it's for your information is really Cisco have what is called a solution IWAN where DMVPN is performed everywhere that is, even through the MPLS network.

That would solve your problem of external routes internal EIGRP but IWAN vs is much more than just that, even if you do not need necessarily to implement the entire solution at a time.

I just thought that it should be mentioned, and if you want more information on this I can direct you to the design guide.

Jon

Numbers of BGP AFI/SAFI

Hi guys,.

I am currently studying for my exam 642-611 MPLS and I was wandering if someone could point me to a repository for numbers of BGP AFI/SAFI.

Specifically, what are the numbers of the AFI for VPNv4 and VPNv6 addresses?

Thank you

Concerning

Scott

Scott,

Here is the link to the list maintained by the Internet Assigned Numbers Authority IANA)

Address family identifier (AFI)

http://www.IANA.org/assignments/address-family-numbers/address-family-numbers.XHTML

Identifier (SAFI) subsequent address family

http://www.IANA.org/assignments/Safi-namespace

Concerning

BGP announcement: How do I remove the attributes "next hop" and "metrics" inherited from OSPF?

Hello

I use a router THAT WAN Cisco ASR1001 connected via BGP AS65075 with our ISP.

This router is connected through OSPF with our Cisco 7206VXR/NPE-G2 firewall.

Topology:

ISP <- bgp="" -="">RT 1001 <- ospf="" -="">FW 7206 <->LAN

On the WAN router, static routes are set to null0 to always announce our class C networks.

Route IP 192.168.10.0 255.255.255.0 Null0 250

...

Network guidelines are placed in our BGP configuration:

router bgp 65075

The log-neighbor BGP-changes

neighbor EBGP-PEER-IPv4-peer group

EBGP-PEER-IPv4 neighbor fall-over bfd

neighbour 192.168.88.138 distance - as 65200

192.168.88.138 a neighbor EBGP peers PEERS-IPv4

192.168.88.138 ISP IPv4 neighbor description

next password 192.168.88.138 7 unknown

!

ipv4 address family

...

network 192.168.10.0

...

a neighbor EBGP-PEER-IPv4 soft-reconfiguration inbound

EBGP-PEER-IPv4 neighbor distribute-list prefix-v4 on

an EBGP-PEER-IPv4 neighbor prefix-maximum 100

neighbor EBGP-PEER-IPv4-1 filter list out

neighbor 192.168.88.138 activate

neighbor 192.168.88.138 filter-list 2

output-address-family

A part of these networs are also learned through OSPF. If these routes are present in the routing table:

RT-01 #sh ro ip 192.168.10.0

Routing for 192.168.10.0/24 entry

Known via "ospf 1", distance 110, metric 20, type extern 2, metric 1 forward

Published by bgp 65075

Last update to 192.168.0.79 on Port - channel1.28, 7w0d there is

Routing descriptor blocks:

* 192.168.0.79, from 192.168.0.71, 7w0d there is, through Port - channel1.28

See metric: 20, number of share of traffic is 1

Because these roads are active in the rounting table. Announcing BGP based on his and attributes "next hop" and "metric" are inherited from OSPF:

RT-01 #sh ip bgp neighbors 192.168.88.138 announced-routes

...

Network Next Hop path metrics LocPrf weight

...

* > 192.168.10.0 192.168.0.79 20 32768 I

...

Is it possible to remove the legacy of OSPF into BGP attributes?

How to set the "next hop" to the value 0.0.0.0 and "metric" to 0?

Thank you

Best regards

Jérôme

Hello Berthier,

NEXT_HOP is a hill & attribute mandatory path including the eBGP value is the IP address of the BGP peer (specified in the neighbor's remote control) where the router learns the prefix. Thus, your peers (eBGP) will still see the IP 192.168.88.138 in your BGP Next Hop as updates. I agree you the output of the command ' sh ip bgp neighbors 192.168.88.138 roads announced "can be confusing, but not worried about it.

Metric 20 is cause of path must be acquired by OSPF. Copy in default atributte MED BGP metric. So I see that you have only a peer is very important change this value because MED is not transitive, if this value is not propagated by other ACE access your provider. Anyway, if you want to change, you must:

1. create a list of prefixes with one or more prefixes that you want to "reset" the MED value:

list of prefixes prefix-to-reset-MED seq 5 permit 192.168.10.0/24

list of prefixes prefix-to-reset-MED seq 10 permit X.X.X

2. create a roadmap

allowed to reset - MED card route 5

match of prefix-to-reset-MED IP prefix-list

the metric value 0

road map provided to zero-MED allowed 10

!

The last road map is necessary to ensure that the rest of the prefixes are sent.

3. apply the road map

a neighbor EBGP-PEER-IPv4-roadmap given to zero-MED on

Concerning

Duplicate BGP AS path

Hello guys,.

Today at awkward work something caught my attention.

The situation returns to BGP, when I run the command sh ip bgp, the output gives me this:

RT52162 #sh ip bgp
Version of BGP table is 56, local router ID is 10.10.0.16
Status codes: deleted, cushioning d s, history of h, * valid, > best, i - internal.
r SIDE-failure, stale S
Source codes: i - IGP, e - EGP,? -incomplete

Network Next Hop path metrics LocPrf weight
* 0.0.0.0 172. **. 161 50 0 15 * 15 * 5 5 65010?
*>                                 172.**.***.169                        0          15**5 65010 ?
*> 10.**.0.16/32      0.0.0.0                    0      32768 ?
*> 10.**.0.0/16          0.0.0.0                    0            32768 ?

The part "BOLD" of the output is exactly the same thing, and this connection works on ATM.

I can't understand this question, so if someone could explain to me why this is happening or how can we solve it, I have other sites configured the with the same configuration and it gives me the same exact result.

Hello

The nearby 172.xxx.xxx.161 done AS_PATH adding by adding at the beginning of his time number one DID when advertising the default route so it is considered to be a neighbor of backup.

Concerning

Alain

Metric IGP into BGP MED copied.

Hi all

I have a problem of BGP that inherits from my IGP metric value in its attribute MED. I have an EBGP peering with my client. I send only specific to my counterpart ebgp routers using network commands in BGP.i receive the prefixes by ospf in my table.i itinerary not to redistribute these routes to bgp, but network command allows to advertise in BGP.

My question is when these prefixes are to be sent to my EBGP peer, he takes the metric value of the IGP and fasten it as value MED. This is an impact on the choice of the route of my client which is in a MPLS cloud. Is this a normal behavior... or how to stop the BGP will send this MED value.

Kind regards

Jean-Pierre

Discovering that you send to an eBGP neighbor, drugs even if you never wanted, can be a surprise, but it happens. If the injected into BGP route (either using 'network' or 'redistribute' order) comes from an IGP, MED is derived from the IGP metric, and the road was announced to a neighboring eBGP with this med. Guiseppe has already provided a solution for your problem. Another option is to inject routes into BGP using the command 'aggregate-address', in which case MED is not defined. Personally, I prefer the configuration command "network" combined with the solution that Giuseppe suggested.

BGP removing the best path

Hello.

I have a problem where the best path to a particular destination is removed by BGP.

To explain.

Site A has 2 links to site B. 1 via a peer eBGP on MPLS, 2 via an iBGP during a backup VPN peer.

I configured the ebgp with a higher weight counterpart so that it is preferred.

The problem is the following.

When the ebgp peer link goes down, the connection via the ibgp peer is preferred.

When the link via the ebgp peer returns to the top, the path of the ebgp peer doesn't come back in the BGP table (in fact it dates back to a second and is then removed).

Could someone help me on this one.

Thank you

Lee

It would go something like this:

Country:

router bgp 65500

nearby MPLS map route setMed out

setMed allowed 10 route map

corresponds to the ip address 1

set 2 med

setMed allowed 20 route map

med game 1

permit access-list 1

RtrC:

router bgp 65500

nearby MPLS map route setMed out

setMed allowed 10 route map

corresponds to the ip address 1

set 2 med

setMed allowed 20 route map

med game 1

permit access-list 1

Let me know if you have any questions,

BGP path selection

Hello

in my bgp table, I have two paths to the defaultroute:

65052:420:0.0.0.0/0, version 4803 BGP routing table entry

Paths: (2 available, excellent #2, table vkb)

Not announced in any position

Local

172.16.24.2 (98 metric) of 172.16.24.2 (172.16.24.62)

Incomplete 755968, metrics, localpref 100 original, valid, internal

Community: RT:65052:420 0 x 8800: 0:8212 0 x 8801: 100:131072 0 x 8802: 65283:624896 0 x 8803: 65281:1500 0 x 8804: 0:2886794964 0 x 8805: 3:0,.

label MPLS/exit nolabel/1602

Local

172.16.24.1 (99 metric) of 172.16.24.1 (172.16.24.61)

Incomplete metric, original 755712, localpref 100, valid, internal, best

Community: RT:65052:420 0 x 8800: 0:8211 0 x 8801: 100:130816 0 x 8802: 65282:624896 0 x 8803: 65299:1500 0 x 8804: 0:2886794963 0 x 8805: 3:0,.

label MPLS/exit nolabel/1410

Why is the way to selected 172.16.24.1 even if the igp metric to 172.16.24.2 is 98 and 172.16.24.1 is 99!

so the way to 172.16.24.2 is better (98).

I am a redistribution of eigrp to the mpls backbone

thx for the answer

Hello

MED for the preferred route is lower than the other. MED is regarded as to the cost of the IGP for the advertising router.

HTH.

-Rob

maximum-paths command help required in BGP

HII...

I use cisco WS-C3750X - 48P switch in the branch with link two different ISP and apply in config. I want to balance traffic going out with two Internet service providers. I have configured "paths of maximum 2" command in BGP.

router bgp 65005
The log-neighbor BGP-changes
neighbour 10.75.112.77 distance - as 4755
neighbour 192.168.179.69 distance - 9583
maximum-paths 2
maximum-paths ibgp 2
!
ipv4 address family
neighbor 10.75.112.77 activate
neighbor 10.75.112.77 - prefix to-ISP list on
neighbor 192.168.179.69 activate
neighbor 192.168.179.69 - prefix to-ISP list on
maximum-paths 2
maximum-paths ibgp 2
No Auto-resume
no synchronization
10.32.60.0 netmask 255.255.255.0
10.32.138.0 netmask 255.255.255.0
network mask 10.45.24.0 255.255.255.192
10.46.185.42 netmask 255.255.255.255
output-address-family

We receive in BGP table two paths for each mention of destination below

Switch ip bgp 10.34.14.0 #sh
10.34.14.0/24, version 187 BGP routing table entry
Paths: (2 available, best #1, table by default-IP-Routing-Table)
MPIO: eBGP iBGP
Not announced in any position
9583 65505
192.168.179.69 (1.7.0.131) 192.168.179.69
Origin, IGP, localpref 100, valid, externally, better
4755 65088
10.75.112.77 (192.168.197.46) 10.75.112.77
Origin, IGP, localpref 100, valid, external
Switch #.

But in the routing table always shows only best path. need two routes in SIDES to balance the load. pls help

Switch # sh ip route 10.34.14.0
Routing for 10.34.14.0/24 entry
Known through 'bgp 65005', 20, 0 distance metric
Tag 9583, external type
192.168.179.69 was last updated 13:36:23 ago
Routing descriptor blocks:
* 192.168.179.69, of 192.168.179.69, 13:36:23 ago
Path metric is 0, number of shares of traffic 1
AS hops 2
Tag route 9583

Switch #.

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Poster

2 maximum paths is only part of what you need. You must also use the secret/hidden command: bgp bestpath as path multipath-relax

MPLS L3VPN BGP AS number

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