ASR901: encapsulation xconnect vs xconnect default port mode

Hi all,

I have a doubt as to the potential difference between the xconnect with lack of encapsulation and the xconnect port mode, is the same thing? One is better than the other? which is the correct implementation and configuration of the port xconnect mode?

Here is my configuration:

ASR901-3 #sh run inter giga 0/5

Building configuration...

Current configuration: 236 bytes

!

interface GigabitEthernet0/5

no ip address

Loopback driver

auto negotiation

No keepalive

service instance 1 ethernet

lack of encapsulation

XConnect 192.168.201.4 123 mpls encapsulation

!

end

17:52:47.338 Jan 10: AToM LDP [192.168.201.4]: sending msg from the notif

17:52:47.338 Jan 10: AToM LDP [192.168.201.4]: sending notif msg type vc 5, cbit 1,.

17:52:47.338 Jan 10: AToM LDP [192.168.201.4]:, vc 123 ID.

17:52:47.338 Jan 10: AToM LDP [192.168.201.4]: group id 0, 29 vc label,.

17:52:47.338 Jan 10: AToM LDP [192.168.201.4]: status, 0 x 1 0 x 7/LDP/ADJ 0 0.

17:52:47.338 Jan 10: AToM LDP [192.168.201.4]: mtu 9216, handful of vc 0xF2000007

17:52:47.338 Jan 10: AToM LDP [192.168.201.4]: VCCV CC 0 x 2, HP 0 x 2

ASR901-3 #sh mpls l2 retail CR 123

Local interface: Gi0/5 place, line up, Ethernet protocol: 1

Destination address: 192.168.201.4, VC ID: 123, status of VC: upward

Output interface: Vl10, imposed label stack {20-25}

Preferred path: not configured

Default path: assets

Next section: 192.168.201.242

Create time: 00:05:20, last status change time: 00:00:32

Last label State FSM change duration: 00:04:02

Signaling protocol: LDP, peer 192.168.201.4:0 upwards

Target Hello: Id 192.168.201.6 (LDP)-> 192.168.201.4, LDP is in PLACE

Graceful restart: don't not configured and enabled not

Non-stop routing: don't not configured and enabled not

Support (local or remote) status TLV: enabled/supported

Watch LDP route: enabled

State/state machine of the label: Workbench, LruRru

Last local dataplane of State received: flawless

Last BFD dataplane received State: not sent

Last BFD counterpart received status monitor: no fault

Last received AC circuit State premises: no fault

Latest local circuit AC status sent: no fault

Last local PW I / f State received IARC: no fault

Last local status of LDP TLV sent: no fault

Last distance LDP TLV received State: no fault

Last LDP ADJ remote of State received: flawless

Labels MPLS VC: 29 local, remote 25

Group ID: 0 local, remote 0

MTU: 9216 local, remote 9216

Description of the remote interface:

Sequencing: persons with disabilities, send the disabled

Control word: on (configured: automatic detection)

Dataplane:

SSM segment/switch ID: 12300/8203 (used), with: 4

Statistics of the VC:

transit package totals: receive 0, send 0

the transit byte totals: receive 0, send 0

transit packet drops: receive 0, seq 0 error, send 0

ASR901-3 #.

the other side:

ASR901-1 #sh run inter giga 0/6

Building configuration...

Current configuration: 147 bytes

!

interface GigabitEthernet0/6

no ip address

Loopback driver

auto negotiation

No keepalive

XConnect 192.168.201.6 123 mpls encapsulation

end

18:49:01.934 Jan 11: AToM LDP [192.168.201.6]: sending msg from the notif

18:49:01.934 Jan 11: AToM LDP [192.168.201.6]: sending notif msg type vc 5, cbit 1,.

18:49:01.934 Jan 11: AToM LDP [192.168.201.6]:, vc 123 ID.

18:49:01.934 Jan 11: AToM LDP [192.168.201.6]: group id 0, label vc 25,.

18:49:01.934 Jan 11: AToM LDP [192.168.201.6]: status, 0 x 1 0 x 7/LDP/ADJ 0 0.

18:49:01.934 Jan 11: AToM LDP [192.168.201.6]: mtu 9216, handful of vc 0xAD000001

18:49:01.934 Jan 11: AToM LDP [192.168.201.6]: VCCV CC 0 x 2, HP 0 x 2

ASR901-1 #sh mpls l2 vc 123 det

Local interface: Gi0/6 upward, line protocol up, Ethernet towards the top

Destination address: 192.168.201.6, VC ID: 123, status of VC: upward

Output interface: Vl10, imposed label stack {18 29}

Preferred path: not configured

Default path: assets

Next section: 192.168.201.246

Create time: 00:19:47, last status change time: 00:16:16

Last label State FSM change duration: 00:19:46

Signaling protocol: LDP, peer 192.168.201.6:0 upwards

Target Hello: Id 192.168.201.4 (LDP)-> 192.168.201.6, LDP is in PLACE

Graceful restart: don't not configured and enabled not

Non-stop routing: don't not configured and enabled not

Support (local or remote) status TLV: enabled/supported

Watch LDP route: enabled

State/state machine of the label: Workbench, LruRru

Last local dataplane of State received: flawless

Last BFD dataplane received State: not sent

Last BFD counterpart received status monitor: no fault

Last received AC circuit State premises: no fault

Latest local circuit AC status sent: no fault

Last local PW I / f State received IARC: no fault

Last local status of LDP TLV sent: no fault

Last distance LDP TLV received State: no fault

Last LDP ADJ remote of State received: flawless

Labels MPLS VC: local 25, 29 remote

Group ID: 0 local, remote 0

MTU: 9216 local, remote 9216

Description of the remote interface:

Sequencing: persons with disabilities, send the disabled

Control word: on (configured: automatic detection)

Dataplane:

SSM segment/switch ID: 4097/4096 (used), with: 1

Statistics of the VC:

transit package totals: receive 0, send 0

the transit byte totals: receive 0, send 0

transit packet drops: receive 0, seq 0 error, send 0

# ASR901-1

In both cases, the loopback driver is set up because I do not have these ports connected to anything. But it's not important at this stage. The thing is that I have two ways to set up the same thing, but I don't know which is the right.

Thank you very much

Emiliano

Hello Emiliano,

In both cases, the encapsulation for xconnect is mpls only. the other encapsulation tht you defined as the service instance is to map an incoming tag to a service instance. If you receive an image without any tag it will be mapped to the instance of service 1.

Say assume that instead of 'default of encapsulation' we confiure "encapsulation dot1q 10" then all the frames coming with 10 tag will be mapped to this service instance.

Now a major difference between the two implementation is, one is the port-based EoMPLS is second evolutionary EoMPLS. In EoMPLS based on port, you can use this port only to L2 circuit service, while as part of the CVS, you can create several service instance and use them for different services.

Probably the biggest advantage of the VCA framework is the ability to support several services by physical port. This means that under a single physical port, you have the following mixed together:

-802. 1 q trunk

-802. 1 q tunnel

-Local connect

-Scalable EoMPLS (EoMPLS xconnect)

-Multipoint Bridging (L2 bypass)

-Multipoint Bridging (VPLS, focused on the SVI EoMPLS)

-L3 termination

Kind regards

Assani

Tags: Cisco Support

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