From: Jason Gardiner (gardiner@xxxxxxxxxx)
Date: Mon Apr 22 2002 - 22:58:31 GMT-3
Okay, I tried this and this is what I found:
Side 1 does not have a paasive interface or a neighbor. Debug shows EIGRP
as multicasts:
2d00h: IP: s=155.100.15.1 (Ethernet0/0), d=224.0.0.10, len 60, rcvd 2
2d00h: IP: s=155.100.15.5 (local), d=224.0.0.10 (Ethernet0/0), len 60,
sending broad/multicast
2d00h: IP: s=155.100.56.5 (local), d=224.0.0.10 (Serial1/0), len 60,
sending bro
Side 2 has a neighbor statement but does not have a passive interface:
10w1d: IP: s=155.100.6.6 (local), d=224.0.0.10 (Loopback0), len 60,
sending broad/multicast
10w1d: IP: s=155.100.6.6 (Loopback0), d=224.0.0.10, len 60, rcvd 2
10w1d: IP: s=155.100.56.6 (local), d=155.100.56.5 (Serial0), len 60,
sending
Notice how EIGRP is multicast over the non-neighbor interfaces and unicast
over the neighbor interface.
Now, side 2 with passive interface on serial 0:
10w1d: IP: s=155.100.56.5 (Serial0), d=224.0.0.10, len 60, rcvd 2
10w1d: IP: s=155.100.56.5 (Serial0), d=224.0.0.10, len 60, rcvd 2
10w1d: IP: s=155.100.6.6 (local), d=224.0.0.10 (Loopback0), len 60,
sending broad/multicast
It's receiving multicast hellos from 155.100.56.5, but is not sending any
packets out that interface.
Conclusion:
Neighbor causes the EIGRP packets to use unicast.
Passive-interface works like OSPF and prevents hellos from being
propagated on the interface in question. THus, adjacencies will not form.
Thanks,
Jason Gardiner
Supervisor, Engineering Services
Sprint Internet Backbone Operations
"You can swim all day in the Sea of Knowledge and
still come out completely dry. Most people do."
Norton Juster
On Mon, 22 Apr 2002, Alex Paulino wrote:
> Hi all, how to configure the unicast neighbor over nbma with Eigrp?
>
> I'm using:
>
> RA)
> router eigrp 30
> no auto-summary
> neighbor 10.1.1.2 interface serial 0.1
> passive-interface serial 0.1
>
> RB)
> router eigrp 30
> no auto-summary
> neighbor 10.1.1.1 interface serial 1.1
> passive-interface serial 1.1
>
> All Frame-relay maps are created, but the neighbor never up.
>
> Thanks for help...
>
> alex
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