From: ccie2be (ccie2be@nyc.rr.com)
Date: Thu Jul 08 2004 - 04:49:48 GMT-3
Peter,
I believe that it's your ospf and isdn configuration that determines whether
or not mcast traffic is sent over the isdn link.
If the isdn link is configured as a ospf demand circuit, then Hello's are
suppressed whether they're sent in mcast packets or not.
If I recall correctly, ospf uses mcast packets on multipoint links not p2p
links. If I'm correct, then if you've configured a dialer interface, that's
considered a p2p link and mcast packets wouldn't be sent by ospf.
If you're using legacy DDR with dialer maps with the broadcast keyword, then
I think mcast packets would be sent unless they're denied in the interesting
traffic definition. But, in that case, ospf might not be able to form an
adjacency over the isdn link.
I'm not exactly sure what you're trying to achieve. Could you elaborate?
----- Original Message -----
From: "Peter Ding" <pding@cisco.com>
To: <ccielab@groupstudy.com>
Sent: Thursday, July 08, 2004 12:42 AM
Subject: Passive-interface loopback0
> Assume I have the lab setup as the following:
>
> R1 -(eigrp)- R2 -(ospf)- R3
>
> loopback0 on R2 is advertised by eigrp. R2 and R3 are connected with Frame
> Relay and ISDN.
>
> Is it must to configure "passive-interface loopback0" on R2 in order not
to
> sent multicast traffic over ISDN link?
>
> router eigrp 90
> passive-interface loopback0
>
> Thanks,
>
> PD
>
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