[j-nsp] Cisco EIGRP across MPLS

[Dermot Williams]

OK, I've actually built more or less the same network here in our lab
and am seeing EIGRP packets across the network (as well as CDP). Problem
solved (as far as I'm concerned, the customer will obviously think
differently), thanks everyone who responded.

Both my test routers are on 7.2R1.7, so the next step for me will be to
roll one back to 7.1R2.2 (to match the production routers) and get a
copy of the configs for the ciscos.

Again, thanks all who helped out on this one.

Dermot

-----Original Message-----
From: michael.firth at bt.com [mailto:michael.firth at bt.com] 
Sent: 02 September 2005 10:00
To: Dermot Williams; juniper-nsp at puck.nether.net
Subject: RE: [j-nsp] Cisco EIGRP across MPLS

When not using L2VPN, Juniper Ethernet interfaces usually discard all
multicast traffic unless PIM is enabled on the interface. Multicast
packets seem to be accounted as Input Errors 'L3 Incompletes'.

Its worth having a look at the 'show interfaces extensive' for the
interface attached to the Cisco and see if the counter is increasing.

There is a hidden configuration command 'set routing-options multicast
interface <name> enable' which will allow the multicast packets into the
box, but whether it will then handle them correctly for L2VPN I don't
know.

The command is needed to allow the use of multicast addressing with P2MP
MPLS LSPs.

Regards

Michael


> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net 
> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of 
> Dermot Williams
> Sent: 02 September 2005 09:37
> To: juniper-nsp at puck.nether.net
> Subject: [j-nsp] Cisco EIGRP across MPLS
> 
> 
> Hi,
> 
>  
> 
> I've been having a problem with a customer of ours who are 
> trying to run EIGRP across an MPLS/L2VPN circuit. On our side 
> of things, there are two J4300s involved; router A is running 
> JUNOS 7.1R2.2 and router B is running JUNOS 7.2R1.7. The 
> customer tells me that when the Cisco attached to B sends 
> multicast EIGRP hellos, Router A receives them. However, when 
> Router A sends multicast EIGRP hellos, they don't arrive at B.
> 
>  
> 
> I have tried to verify this by using monitor traffic 
> interface on the appropriate vlan-ccc interface, but I don't 
> see any traffic at all - I'm assuming that this is to be 
> expected because of the encapsulation on the interface. 
> However, I set up a small test in our lab, whereby I 
> configured EIGRP on a Cisco 831, connected it directly to 
> fe-0/0/0 on a J4300 and ran the monitor command; again, no 
> packets and this was on an interface with standard Ethernet 
> encapsulation. To confirm my Cisco's config, I used Ethereal 
> to sniff the EIGRP-running interface and was able to confirm 
> that there are indeed EIGRP multicast hellos being transmitted.
> 
>  
> 
> Does anyone have any experience with EIGRP (or other multicast
> protocols) across MPLS circuits? Does it work?
> 
>  
> 
> Any help would be hugely appreciated.
> 
>  
> 
> Regards,
> 
>  
> 
> Dermot Williams
> 
>  
> 
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