Re: L3 mpls vpn multicast issue on ios xr

Hi guys,
for those interested in how this story ended.

There is a bug in IOS XR as of 4.3.2,

----------- begin quote ----------

CSCud77965

Cannot ping vrf loopback address that joined mcast on MVPN

Externally found

enhancement (Sev6)

The conclusion based on our developers analysis is that, in IOS-XR, we need
to set mhost default interface to be able to run interface joining the
group and pingable.

For the mhost to be registered, it must be coming from *physical
interface*, as it ties to the linecard.

So, this behavior we encountered in your testing is expected, as you have
only loopback (virtual interface) and does not have physical interface
joining the mcast address.

--------------- end quote ----------

We also found helpful to increase MDT MTU to 1524 as our customer multicast
streams would use large UDP packets up to MTU limits.

HTH

A.

On Tue, Nov 5, 2013 at 6:05 AM, Alexei Monastyrnyi <alexeim73_at_gmail.com>
wrote:

> Hello lads,
> Having a problem with multicast inside a L3 MPLS VPN on IOS XR. We have a
> mix of XR and IOS PEs. In MPLS core I can join Lo interface to a group on
> any router and then ping it from any other router. Mfib and mrib on XR have
> both (*,G) and (S,G). Same good on IOS.
>
> Setup features a single static RP for now on one of XR routers.
>
> Inside VPN all PEs see each other as PIM neighbors via MDT tunnels. MDT
> groups are configured with default 232/8 SSM range. Default MDT group is
> 232.0.0.1 and data MDT groups are 232.0.x.0/24 where x is unique per site.
>
> Each PE has Lo10 in this VRF with PIM SM enabled and test MC group joined.
> MP BGP has mdt family activated on both RRs and RR clients.
>
> From RP and IOS routers when I ping that MC group inside VRF only IOS
> routers reply, no (S,G) appears on on XR, but happily appears on IOS
> routers. Seems like mdt tunnels terminated on XR are not well.
>
> I went through INE SPv3 WB example for multicast VPN but they use BSR as
> opposed to static RP in my case.
>
> Any suggestions? I'll provide relevant config sections tomorrow, don't
> have them handy now. :-)
> Sorry for rather long-winded write-up.
>
> TIA
> Alexei
>
> Sent from my iPad
>

On 11 November 2013 01:24, Radioactive Frog <pbhatkoti_at_gmail.com> wrote:

> are you preparing for SP lab mate?
>
> also with your this issue, are you using XR simulator?
>
>
>
>
> On Tue, Nov 5, 2013 at 6:05 AM, Alexei Monastyrnyi <alexeim73_at_gmail.com>wrote:
>
>> Hello lads,
>> Having a problem with multicast inside a L3 MPLS VPN on IOS XR. We have a
>> mix of XR and IOS PEs. In MPLS core I can join Lo interface to a group on
>> any router and then ping it from any other router. Mfib and mrib on XR have
>> both (*,G) and (S,G). Same good on IOS.
>>
>> Setup features a single static RP for now on one of XR routers.
>>
>> Inside VPN all PEs see each other as PIM neighbors via MDT tunnels. MDT
>> groups are configured with default 232/8 SSM range. Default MDT group is
>> 232.0.0.1 and data MDT groups are 232.0.x.0/24 where x is unique per site.
>>
>> Each PE has Lo10 in this VRF with PIM SM enabled and test MC group
>> joined. MP BGP has mdt family activated on both RRs and RR clients.
>>
>> From RP and IOS routers when I ping that MC group inside VRF only IOS
>> routers reply, no (S,G) appears on on XR, but happily appears on IOS
>> routers. Seems like mdt tunnels terminated on XR are not well.
>>
>> I went through INE SPv3 WB example for multicast VPN but they use BSR as
>> opposed to static RP in my case.
>>
>> Any suggestions? I'll provide relevant config sections tomorrow, don't
>> have them handy now. :-)
>> Sorry for rather long-winded write-up.
>>
>> TIA
>> Alexei
>>
>> Sent from my iPad
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
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Received on Tue Feb 18 2014 - 10:12:49 ART