Establishing internet Layer 3 switch

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• Configuration of several interfaces vlan on a layer 3 switch

  I am trying to incorporate a layer 3 switch in a network. (see figure 1 below). My problem is that in the configuration below, the layer 3 switch seems to offer no additional benefit on a layer 2 switch, because it does not pass packets from Layer 3, instead, it will take an additional router configuration.

  If I set up 2 interfaces like no switchports (diagram2) and create virtual interfaces on the switch of level 3, that is to say 0.1/g0, g0/0.2, 0.3/g0, g0/1.1,g0/1.2, g0/1.3, configure dot1q encapsulation and add ip addresses and subnets on each interface, so I understand that I can use the switch of level 3 as a router.

  However this introduces a new problem now, VLAN 1 is on both interfaces, so devices in VLAN 1 on each interface will have point to the default gateway on this specific interface and features of VLAN 1 on G0/0.1 interface must be configured with a different subnet than those on G0/1.1 interface.

  It does not seem logical, am I missing something?

  Assignment.jpg

  

  Figure 1

  assignment2.jpg

  

  Paul

  On a L3 switch you do not configure subinterfaces (usually).

  You create what's called Lass (Switched Virtual Interfaces) instead of this, and what are your L3 interfaces.

  If your L3 switch ports are ports of L2 or other trunks or assigned to a VLAN specific.

  For each VLAN you want to route you create then a SVI IE. -

  int vlan
  IP x.x.x.x
  No tap

  and the default gateway for clients in this vlan is the IP assigned to the SVI.

  Any other configuration of L3 interface, you add to the SVI.

  The only time wherever you actually use the ports of L3 is when you connect to a router for example.

  Jon

• Is it possible to superimpose a 3cr17161-91 3Com with another Cisco layer 3 switch?

  Hello

  Nice day.  I would like to ask whether it is possible to superimpose a 3cr17161-91 3Com to a layer 3 Switch Cisco? The two will be stacked using the SFP modules available to the general public.

  Thank you

  Hi Rey, not with switches for small businesses. Small business past stack with their own range of products running the same software. Something like SGE2010 won't stack with SG500-48 as example.

  -Tom
  Please evaluate the useful messages

• VLAN a layer 2 switch, two WAP121 and RV110w

  Hello

  I try to configure the 4 VLANS in an office with 2 WAP121 and a RV110W, between the two is a switch POE from D-link DES-1210-28 P. I have a patch cable to the d-link to the router. How to configure the router so all VLAN light them well port on the router? Because soon I change the id VLANS on one of the SSID on the WAP121 I lose the connection to the internet and local servers for this SSID.

  the switch is on on the ports of the WAP121 and the RV110W connected to untagged.

  Best regards

  Villy

  You can call us at the 866-606-1866 in the Canada or the United States.  If you are in another country, you will find your number for local support from the link below.  Please have your CCOID (your Cisco.com user name) and the serial number of the RV110W of ability when you call.

  http://www.Cisco.com/c/en/us/support/Web/TSD-Cisco-small-business-suppor...

  Kind regards

  Mike.V

• Layer 2 switch decision and redundancy NIC teaming/switch

  Hello

  Imagine that I need to provide a reliable network between two mainframe environment.

  Basically, there is a NIC communication 'intra' between the two chassis. This 'share' NIC could be connected in a switched environment isolated too long which supports 1 GB. The idea is, instead of using a VLAN in our production environment existing to allow communication between the two chassis, people would use a small switch instead, totally isolated from the network to provide such a service of communication intra-NIC between the two chassis. My questions are:

  (a) agree you generally keeping a separate switch (maybe a new layer 2 2900 XL?) I could provide a more reliable environment than if I plug on new servers VLAN into my existing 3750 switch? Note that my switch 3750 in production is not a stackwise. It's just an autonomous one.

  (b) a small 2900XL switch (8 ports?) can do the 1000 MB? Also, I have recommended that we use copper instead of fiber for this.

  (c) in the past I heard people talk about problems with the grouping itself. I wonder if I just use a Gigabit NIC, copper, I either offer. Again, please let me know where the layer 2900 XL switches do not support gigabit.

  Your intuition is very valuable. Thank you.

  Yes, 2960 should suffice in this case your need. It has 24-port and 48-port port 10/100/1000 version as well.

• Re: Satellite C660-125 - internet stop when switch to battery

  He was only a few weeks and I noticed that disconnect power cable a minute or two later, I lose the internet connection, even if the battery is fully charged.

  Looked at the menu of energy saving, but could not see option to stop that happening?

  Are you using a LAN or WLAN connection?

• Switchport access and trunk on Layer 3 switch problems

  Hi all

  I was building a network design just for practice and I came across a problem that I didn't understand. Can someone please help. I have attached a picture to clarify things.

  Please let me know if you need information to answer my question. Thank you

  Francis

  Yes the router on a stick. However only vlan 100 is necessary because you have between multilayer switch and router ospf.

  Please don't forget to rate and select the correct answer

• With the help of new access points with old WLC 4100; LWAPP layer 2 switching 3-tier

  Hi all

  We currently use two solutions Wiresless LAN - a 10 AP1230 access points-based autonomous (5 years) and a solution based on a Cisco WLC 4100 (4112, running 3.2) with 12 AP1010 LWAPP access points.

  First thing, we are considering to replace the stand-alone solution with the WLC one. However, I'm not sure if we can use the new access points such as the LAP1041N or the LAP1252G with our current 4100 WLC. Access reported data sheets 'Cisco Unified Wireless Network Software Release 7.0 or later version' 'software '. Does this mean that these access points can only be used with controllers running 7.0 or later?

  If we are unable to use the new access points with our current WLC and need to buy a new controller: can we use access points AP1010 current with a new WLC as the Cisco 4402?

  Second thing, it is that we want to expand the networks configured on the WLC 4100 to another site that is connected via VPN wireless. Wireless Setup guide indicates that the LWAPP mode can be changed from Layer 2 to 3 layers so that the access points can be configured with an IP address, which allows you to place access points basically anywhere as long as IP connectivity exists between the AP and the WLC.

  Y does it as described in a document with the change of mode LWAPP layer 2 to 3 layers? Or ist just the following steps (if I understand correctly):

  -Change the Mode of Transport LWAPP on the controller of layer 2 to 3 layers

  -Creation of a PA-manager interface with an IP address in the same subnet as the management interface (tried that, without changing LWAPP mode transport first and not was not possible - error)

  With regard to different sites:

  -Configure option DHCP 43 with the IP address of the WLC or DNS with CISCO-LWAPP - CONTROLLER.localdomain

  -Make sure that the interface ap - manager can reach points on the different site

  Is it really just as simple as that? All information about it is very appreciated!

  / edit: I would also like to know if the 1260 series access point are backward compatible with 802. 11B. Whereas it is stated in 1040 and 1250 for example series data sheets, it is not particularly mentioned in 1260 data sheet.

  Thank you

  Michael

  Well, let's start with the simple question/answer

  With regard to different sites:

  -Configure option DHCP 43 with the IP address of the WLC or DNS with CISCO-LWAPP - CONTROLLER.localdomain

  -Make sure that the interface ap - manager can reach points on the different site

  Yes, it's as simple as that.

  As for other issues, looks like you would be better served with a forklift upgrade.  New controllers and new AP.

  Now, the AP 1230/1240/1250. all work on the 4.2, 1140 code starts with 5.2 and 1040/3500/1260 are 7.0

  The AP 1000 series is not supported after 4.2 code.

  Refer to here for the complete list of the AP and taken codes supported:

  http://www.Cisco.com/en/us/docs/wireless/controller/release/notes/crn7.0.html#wp610751

  From what I see, the 4100 is not supported after the train of 3.2.

  So, it really depends on what you are trying to accomplish with the upgrade.  If you are looking for a 80.211n support, you really want to be 5.2 or better, we had some problems with MRR + 40 Mhz channels, 4.2, 5 GHz band only.

• I get error message "Unable to establish internet connection" when I try and run updates.

  I have no problem connecting with other programs.

  solved the problem myself.

  the answer was in the list of "services".

• Internet access is available on the switch itself but on the guests of all the VLAN no

  I have 2 switches L3 core 3650 catalyst named core 1 and 2 is the basic problem I have internet on the switch it free I can ping 8.8.8.8 from switch and I can also ping 8.8.8.8 source vlan x I have 1 double nat on the dsl modem and the second on the main switch wrong set the config of the base switch 1 thanks a lot any help in advance to have a nice day all the!

  Hello

  TAR is only compatible with the switches of the series 6500 cisco IOS family.

  Remove nat and just send the ordinary traffic until the cable modem where the real NAT is configired for further communication to the internet.

  It could be that useful...

  -GI

  Rate if this can help

• Internet through the network Switch

  Hey,.

  So, assuming that there is a switch of fiber optic network in a building and the apartments in the building are connected to the Internet through this switch via standard Ethernet cables and the other end of the Ethernet cable is a router without wire-House. Now, my question is: the other apartments in the building are connected to the switch access Homegroup LAN/Windows (or in other words: computers in another apartment)?
  Thanks in advance.

  Your individual home router should be a DSL (no ADSL) router and can be identified by the fact that although all ports are physically identical (so a LAN cable would be all of them), is not separate and labeled on the lines of the cable/DSL/WAN port. It is this port which is connected to the backbone of building connected to the incoming fiber router

  As with any home router between this port and your port WiFi/LAN is a firewall. By default, the firewall does not allow incoming connections from the WAN port the LAN port. Ideally one who set up the router base also fiber not allow traffic pass directly between its own LAN ports which are actually links to the clients in each apartment, although this can not be done because they know that firewall routers are used for each client.

• Try to change the mode of the system of a switch SRW208MP layer 3

  I am trying to configure a layer 3 switch SRW208MP to do some basic routing, but I can't configure it's routing table. At first, I couldn't find all the options to give a VLAN an IP anywhere. I searched on the interface of the console, as well as the web interface. The manual makes no mention of what that either.

  After hitting this dead-end, I updated the firmware to the latest version, and the interface of the console got a new menu with the name 'Mode (2/3 layer) system'. Unfortunately, it only allows me to display mode, not change, and the mode is currently set to Layer 2, independent. Is there some sort of procedure I should follow to spend the 3 layer system mode? Maybe I need to disable certain features that the switch can not do mode layer 3, as well as the ability to change layer 3 is active in the interface of the console?

  Hi, Vitaliy, the old switch srw208mp isn't a layer 3 device. Srw208mp-k9 can be layer 3 but is set by default to the layer 2.

  -Tom
  Please evaluate the useful messages

• Cisco Wireless router model WRT120N guard give up Internet connection

  My wireless router will work for 6-8 hours, and then remove the connection to the internet.   I switch the modem and the router several times to re-establish the connection.  I'm also using a Netgear Access Point.

  I use:

  Charter high-speed Internet

  Motorola Modem

  Model Cisco WRT120N router

  Parameters

  Mixed-mode

  Channel Auto width - 20 MHz or 40 MHz

  Security - Personal WPA2

  Disabled SSID broadcast

  Firmware Version v1.0.04

  Automatic connection Type - Conf DHCP

  Beacon interval - 50

  Fragmentation threshold 2304

  RTS threshold 2304

  All other settings are default.

  When I unplug the modem to the router and plug it on the desktop I have internet service.

  The connection is also falling only on wired or wireless?

  Try to update the firmware on your router.
  Connect to the computer with the Ethernet cable to the router.
  Download the latest firmware from the site Web of Linksys and save it to your computer. Open the router configuration page. Click the Administration tab and switch to the sub tab upgrade the Firmware through the firmware file that you have already downloaded and update on your router.
  After upgrading the firmware on the router, it is recommended that you must reset the router and reconfigure. Press and hold the reset button on the router for 30 seconds. Release the reset button and wait 10 seconds. Power cycle the router and reconfigure.

• configuration of VLAN and routing problem 6224 switch

  I, m having a problem accessing internet to vlan 10. I can ping everything of all the VLANS. My internet router/firewall is on ethernet 1/g11 and has an ip address of 192.168.5.254. I have no problem accessing internet to vlan 20. I add a static route to my router/firewall. What Miss me? This is my first configure a layer 3 switch.

  Configure
  database of VLAN
  VLAN 10.20
  output
  battery
  1 1 member
  output
  IP 10.10.10.1 255.255.255.0
  default IP gateway - 10.10.10.254
  IP routing
  IP route 0.0.0.0 0.0.0.0 192.168.5.254
  interface vlan 10
  Routing
  IP 192.168.100.1 address 255.255.255.0
  output
  interface vlan 20
  Routing

  192.168.5.1 IP address 255.255.255.0
  output

  !
  interface ethernet 1/g1
  switchport mode general
  pvid switchport General 10
  No switchport acceptable-framework-type general tag only
  VLAN allowed switchport General add 10
  output
  !
  interface ethernet 1/g2
  switchport mode general
  pvid switchport General 10
  No switchport acceptable-framework-type general tag only
  VLAN allowed switchport General add 10
  output
  !
  interface ethernet 1/g11
  switchport mode general
  switchport General pvid 20

  No switchport acceptable-framework-type general tag only
  VLAN allowed switchport General add 20
  output
  !
  interface ethernet 1/g12
  switchport mode general
  switchport General pvid 20
  No switchport acceptable-framework-type general tag only
  VLAN allowed switchport General add 20
  output
  !
  interface ethernet 1/g13
  switchport mode general
  switchport General pvid 20
  No switchport acceptable-framework-type general tag only
  VLAN allowed switchport General add 20
  output
  output

  Route ip console #show

  The traffic code: R - RIP derived, O - OSPF derived, C - connected, S - static
  B - BGP derived, IA - 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 0.0.0.0/0 [1/0] via 192.168.5.254, vlan 20
  C 192.168.5.0/24 [0/0], directly connected, vlan 20
  192.168.100.0/24 C [0/0], directly connected, vlan 10

  Console #.

  
  

• Unable to access the second switch management

  I have two switches, as follows:

  Switch #1 is a SG300-20, L3 mode, *. 254.
  VLAN3 is 192.168.3.254.
  VLAN10 is 192.168.10.x.
  VLAN20 is 192.168.20.x.
  1 port is a port of access on VLAN3.
  2-10 ports are the ports of access on VLAN10.
  11-19 ports are on VLAN20 access ports.
  20 port is a trunk, PVID VLAN3 untagged VLAN 10 and 20 are marked.
  A cable connects port 20 to port to another switch 10.

  Switch #2 is a SG300-10, L2 mode, peripheral IP set to 192.168.3.253.
  VLAN3 defined as same switch #1.
  VLAN10 is defined as same switch #1.
  VLAN20 is defined as same switch #1.
  Port 1 is access ports on VLAN3.
  2 to 5 ports are ports of access on VLAN10.
  6-9 ports are ports of access on VLAN20.
  10 port is a trunk, PVID VLAN3 untagged VLAN 10 and 20 are marked.

  The question that I have is that any PC on any port on any switch, I can browse any of the VLAN IP to *.254 and access management SG300-20.  However, if I try to go on any IP of the VLAN to the *. 253, it expires and can not access.

  The only way I can access the SG300-10 management is by directly connecting a PC to the switch 1 Port 1 or switch 2-port 1 or 10, setting the PC to a 3.x IP IP.  I can then navigate to *.253 and it works.  How can I ensure that I can access the management console from any PC to any port?  Thanks in advance.

  Either way, everything else works as it should.  The DHCP and DNS server on the switch 1 Port 9 to 192.168.20.1 works very well, and the Internet connected to switch 1 Port 2 to 192.168.10.1 is accessible on all three VLANS.

  Hello Terry, it seems that your layer 2 switch has no default gateway defined on it.