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

[Aaron Shultz]

Hi Andrei,

Your vlan tag rewrite configuration is correct. I would look for the
problem elsewhere, though I would recommend getting working L2 connectivity
on either side with equivalent tags before adding re-write into the mix.
You can use*show otv vlan* to verify each overlay interface is carrying the
intended traffic.

Since you're running in a virtual environment, also make sure any virtual
switching involved is set to work in promiscuous mac mode (vmware vswitch
etc..).

Aaron

On Mon, Aug 31, 2015 at 12:53 PM, Andrei Kozlov <ak at gaaga.org> wrote:

> 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
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