[c-nsp] OTV between couple of CSRs 1000v and dot1q TAG rewriting

[Andrei Kozlov]

Hello everyone.

I have couple of CSRs 1000v which can reach each other via IP network. 1st
CSR is in datacenter LEFT and 2nd CSR is in datacenter RIGHT. Site
interfaces of CSRs are dot1q trunks. A task is to extend broadcast segment
between data centres using OTV feature, considering that dot1q tag in
DC-LEFT is 111 and in DC-RIGHT is 11. Last circumstance requires dot1q
rewriting to be done as described in command reference:

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/wan/command/wan-cr-book/mace_enable_through_rtcp_regenerate.html#wp1867662720

I want to apply tag rewriting on CSR-left by doing configuration as you can
see below. I see OTV-adjacency is OK and IS-IS exchanges MAC addresses
between OTV-peers, but communication between end-systems doesn't work;
there are no MAC<>IP mapping in arp tables of the end-hosts. At the moment
I suspect that reason of the issue might be with tag rewriting.


I would appreciate for any advise regarding usage of rewrite ingress tag
command. Am I using it correctly or missed something? Thanks in advance.

==========Configuration on the CSR-left

interface Overlay1
 no ip address
 otv join-interface GigabitEthernet1
 otv adjacency-server unicast-only
 service instance 111 ethernet
  encapsulation dot1q 11
  bridge-domain 111
 !
end

interface GigabitEthernet2
 description **OTV LAN-FACED**
 no ip address
 negotiation auto
 service instance 111 ethernet
  encapsulation dot1q 111
  rewrite ingress tag translate 1-to-1 dot1q 11 symmetric
  bridge-domain 111
 !
 service instance 999 ethernet
  encapsulation dot1q 999
  bridge-domain 999
 !
end



==========Configuration on the CSR-right

interface Overlay1
 no ip address
 otv join-interface GigabitEthernet1
 otv use-adjacency-server 10.67.44.22 unicast-only
 service instance 111 ethernet
  encapsulation dot1q 11
  bridge-domain 111
 !
end
interface GigabitEthernet2
 description **OTV LAN-FACED**
 no ip address
 negotiation auto
 service instance 111 ethernet
  encapsulation dot1q 11
  bridge-domain 111
 !
 service instance 999 ethernet
  encapsulation dot1q 999
  bridge-domain 999
 !
end