[c-nsp] Cisco ME3600X and Bridge-Domain Routing config question

Reuben Farrelly reuben-cisco-nsp at reub.net
Mon Nov 14 04:37:18 EST 2011


I've recently started to explore the more "interesting" features of the 
ME3600X platform and one of the things I have been looking at is 
starting to provision customers using EVC type configuration, so I can 
do vlan tag remapping and other nice things in the coming months.

Previously I've been just using SVI's and trunk ports - which has worked 
reasonably well, but has some limitations in terms of scalability and 
features.

At the moment I'm starting off small and looking to set up just one 
brand new access ethernet service for a customer for now to test out the 
concept and familiarise myself with the configuration before I look to 
deploy this across the board.  [NB: The service was meant to be ordered 
as a trunk but was incorrectly provisioned and I've been told to get it 
working ASAP, so for the meantime I'm stuck with it being an access 
port, but it is almost certain it will become a trunk service in the 
future and I have other trunk ports I can deploy with].

However I'm clearly missing something here, as the switch just won't let 
me apply the config.

The old configuration which works is:

interface GigabitEthernet0/15
  description CUSTOMER - X
  port-type nni
  switchport access vlan 780
  spanning-tree portfast
!
interface Vlan780
  description CUSTOMER - X
  vrf forwarding CUSTOMER-VRF
  bandwidth 30000
  ip address XXX.XXX.96.69 255.255.255.252
  no ip proxy-arp
end

This is all good.

Now here is what I was proposing as the equivalent EVC config:

interface GigabitEthernet0/15
  description CUSTOMER - X
  port-type nni
  switchport trunk allowed vlan none
  switchport mode trunk
  service instance 780 ethernet
   encapsulation untagged
   bridge-domain 780
  !
interface Vlan780
  description CUSTOMER - X
  bandwidth 30000
  ip address XXX.XXX.96.69 255.255.255.252
  no ip proxy-arp
end

The interface config applies fine, but the SVI refuses to take an IP 
address:

sw1.qld(config-if)# ip address XXX.XXX.96.69 255.255.255.252
%IP address cannot be configured on bridge domain 780 EFP & Switchports 
or EFPs
sw1.qld(config-if)#

Ok, so let's go to the documentation, clearly I must be doing something 
wrong.

http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/12.2_52_ey/configuration/guide/swevc.pdf

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

This is an example of configuring bridge-domain routing with a single 
tag EFP:
Switch (config)# interface gigabitethernet0/2
Switch (config)# switchport mode trunk
Switch (config)# switchport trunk allowed vlan none
Switch (config-if)# service instance 1 Ethernet
Switch (config-if-srv)# encapsulation dot1q 10
Switch (config-if-srv)# rewrite ingress tag pop 1 symmetric
Switch (config-if-srv)# bridge-domain 100
Switch (config)# interface vlan 100
Switch (config-if)# ip address 20.1.1.1 255.255.255.255

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

Hmm, not that different to what I was trying, but let's try the example 
from the documentation - changing Gig0/2 to Gi0/5 as Gi0/2 is used on my 
switch:

sw1.qld(config)#default interface gig0/5
Interface GigabitEthernet0/5 set to default configuration
sw1.qld(config)#interface gigabitethernet0/5
sw1.qld(config-if)#switchport mode trunk
sw1.qld(config-if)#switchport trunk allowed vlan none
sw1.qld(config-if)#service instance 1 Ethernet
sw1.qld(config-if-srv)#encapsulation dot1q 10
sw1.qld(config-if-srv)# rewrite ingress tag pop 1 symmetric
sw1.qld(config-if-srv)# bridge-domain 100
sw1.qld(config-if-srv)#interface vlan 100
sw1.qld(config-if)#ip address 20.1.1.1 255.255.255.255
%IP address cannot be configured on bridge domain 100 EFP & Switchports 
or EFPs
sw1.qld(config-if)#

Ok now I'm confused.  The documentation example doesn't work either. 
I'm not too sure where to look next.

What exactly am I doing wrong?

I'm running 12.2(52)EY3a on the switches and I cannot upgrade to 
15.1(2)EY as the units will not link up ports with hardcoded speed and 
duplex (CSCtr83418) and also won't switch IPv6 traffic through the 
switch (CSCtr83500) either, even if configured only for IPv4, so we're 
stuck on the old release until some code comes out which doesn't break 
more than it fixes.  Is this doable in 15.1(2)EY though anyway?

Which reminds me, where -is- 15.1(2)EY rebuild which was planned for 
September, then 30th October, and now it's mid November and it's still 
MIA?  IPv6 anyone?

Reuben





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