From: Zack (Doc) (zack@tnan.net)
Date: Thu Apr 19 2007 - 16:36:58 ART
I'm not sure why you saw EIGRP packets on the hub, but the two DocCD
entries are not mutually exclusive, and they are both correct.
The first is simply is saying the EIGRP routing updates and hello
messages will not be sent out that interface. Making it impossible to
form an adjacency.
The second link is saying that while that interface is passive, it's
"disabled" for EIGRP, but EIGRP will still learn the route of that
interface (the network corresponding to it's IP address) and advertise
it into EIGRP.
On 4/19/07, graham@cisco-engineer.com <graham@cisco-engineer.com> wrote:
> Group,
>
>
>
> I am getting some conflicting info from the Doc-CD on the Passive-interface
> command;
>
>
>
> http://www.cisco.com/univercd
> <http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cr/hirp_
> r/rte_eih.htm#wp1000250>
> /cc/td/doc/product/software/ios124/124cr/hirp_r/rte_eih.htm#wp1000250
>
>
>
> The link above states
>
>
>
> Configuring the passive-interface command suppresses all incoming and
> outgoing routing updates and hello messages. EIGRP neighbor adjacencies
> cannot be established or maintained over an interface that is configured as
> passive. "
>
>
>
> Yet this link;
>
>
>
> http://www.cisco.com/univercd
> <http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cr/hirp_
> r/rte_pih.htm#wp1124419>
> /cc/td/doc/product/software/ios124/124cr/hirp_r/rte_pih.htm#wp1124419
>
>
>
> "Enhanced Interior Gateway Routing Protocol (EIGRP) is disabled on an
> interface that is configured as passive although it advertises the route. "
>
>
>
> Perhaps its me being silly, I always believed the first quote was correct
> for EIGRP, and looking at Debugs on a network would make it true, but then I
> decided to hub and "ethereal/wireshark" the packets outgoing and saw IP
> protocol 88 being sent (EIGRP)
>
>
>
> Does someone have an authoritative answer on this one?
>
>
>
>
>
> Thanks
>
>
>
> Graham
>
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