VLAN Translation with MPLS xconnect

Unanswered Question
Dec 11th, 2009
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Hello,


Are vlan translations supported using 3750ME and 7606?


I'm trying to turn up an SVI xconnect between two PE boxes (3750ME and 7606) over our MPLS network, but when I use different interface VLANs with matching VCIDs, the VLAN on the client switch that's attached to the 7606 PE will go into *PVID_Inc. I've built this before between a pair of 7606 PEs but this is the first attempt using a 3750 as a PE.


Below are some of the configs for the devices:


3750ME-pe1#show run int vlan10
Building configuration...

Current configuration : 121 bytes
!
interface Vlan10
description *****

no ip address
mpls ip
  xconnect 172.24.100.1 1714 encapsulation mpls
end
3750ME-pe1#


7606-pe1#show run int vlan 1714
Building configuration...

Current configuration : 107 bytes
!
interface Vlan1714
description *****
mtu 1546
no ip address
mpls ip
xconnect vfi *****
end

7606-pe1#


7606-pe1#show run int g2/31
Building configuration...

Current configuration : 270 bytes
!
interface GigabitEthernet2/31
description Client-3550-001_Fa0/24
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 556,610,997,1700-1705,1707-1709,1713,1714,1716
switchport trunk allowed vlan add 1725-1727
switchport mode trunk
end

7606-pe1#


This is the ouput from the client switch attached to a trunk port on the 7606


client-3550-001#show run int fa0/24
Building configuration...

Current configuration : 240 bytes
!
interface FastEthernet0/24
description 7606-pe1_4/31
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 556,610,997,1700-1705,1707-1709,1713,1714,1716
switchport trunk allowed vlan add 1725-1727
switchport mode trunk
end

client-3550-001#


client-3550-001#show spanning-tree vlan 1714

VLAN1714
  Spanning tree enabled protocol rstp
  Root ID    Priority    34482
             Address     000e.d766.6880
             This bridge is the root
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    34482  (priority 32768 sys-id-ext 1714)
             Address     000e.d766.6880
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/24              Desg BKN*19        128.24   P2p *PVID_Inc


client-3550-001#


Dec 11 07:32:05.256 EST: %SPANTREE-2-RECV_PVID_ERR: Received BPDU with inconsistent peer vlan id 10 on FastEthernet0/24 VLAN1714.
Dec 11 07:32:05.256 EST: %SPANTREE-2-BLOCK_PVID_LOCAL: Blocking FastEthernet0/24 on VLAN1714. Inconsistent local vlan.



Thanks.


--- Dominique

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Dominique Demore Fri, 12/11/2009 - 07:49
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Hi Reza,


Thanks for the reply.


I guess I should have stated that this is a 3750 Metro switch (ME-C3750-24TE-M). This switch connect to one of our P boxes via the ES ports. What I'm trying to build is an EoMPLS xconnect over SVI. I do agree that on "regular" 3750s MPLS isn't supported.


Hope that helps


Thanks.


-- Dominique

Reza Sharifi Fri, 12/11/2009 - 08:36
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    2017 LAN

Hi Dominique,


Thanks for clarification.

On the 3750-ME, are you using the SFP ES ports?

I believe those are the only 2 ports that support layer-2 layer-3 MPLS/VPN


Reza

Dominique Demore Fri, 12/11/2009 - 08:40
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Yup.


The "uplink" port is on g1/1/1 for this 3750 which connect to a port on an ES20 in a 7606


Thanks.


-- Dominique

Giuseppe Larosa Fri, 12/11/2009 - 09:56
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Hello Dominique,

I remember a feature called vlan rewrite in EoMPLS on GSR routers.


looking at feature navigator


Subinterface to EoMPLS VC Mapping


I think that if this is similar to vlan rewrite you may be able to setup the VC.

This feature is supported on C7600 side with sup720



Sub-interface Xconnect, also called VLAN-edge Xconnect

Sub-interface Xconnect differs from Interface Xconnect because the ingress port is a trunk (such as dot1Q). The switch removes the 1Q header, extracts the VLAN number, determines the associated sub-interface, and performs the cross-connect with the associated VLAN at the other side of the network. This simulates VLAN-to-VLAN switching (at long distance through the MPLS network). VLAN renumbering is possible, but it adds complexity to the design.


http://www.cisco.com/en/US/docs/solutions/Enterprise/Data_Center/HA_Clusters/HA_IAF_5.html



For your hardware there are specific commands for ES linecard


see

http://www.cisco.com/en/US/docs/routers/7600/install_config/ES40_config_guide/es40_chap6.html#wp1385107


the rewrite ingress tag command has many options and the 1-to-1 option should be the right one.


Hope to help

Giuseppe

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