From: Steven van Jaarsveld (Steven.vanJaarsveld@btgroup.co.za)
Date: Thu Apr 19 2007 - 17:16:38 ART
The interface does not advertise the routes.
The router advertises the subnet for the passive interface out of the
other interfaces that have neighborships to other EIGRP Routers.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Edison Ortiz
Sent: 19 April 2007 09:58 PM
To: ccielab@groupstudy.com
Subject: Re: Passive-Interface Command (EIGRP)
It will advertise routes if it has neighbors via other interfaces.
----- Original Message -----
From: "Vince Mashburn" <cciegroupstudy@gmail.com>
To: <graham@cisco-engineer.com>
Cc: <ccielab@groupstudy.com>
Sent: Thursday, April 19, 2007 3:40 PM
Subject: Re: Passive-Interface Command (EIGRP)
>I don't see how it could still advertise routes since neighbor
>relationships
> won't be formed with passive interface configured. EIGRP cannot
advertise
> routes to devices that it does not have neighbor adjacencies to.
>
> 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/hi
rp_
>> 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/hi
rp_
>> 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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