From: McCallum, Robert (robert.mccallum@thus.net)
Date: Thu Oct 20 2005 - 09:14:39 GMT-3
I must be missing something here but to advertise a connected network in
isis you must place the ip router isis command on the interface. If you
don't want to advertise a certain interface then just don't place that
command on the interface.
Robert McCallum CCIE #8757
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of Danny Muizebelt
> Sent: 20 October 2005 12:13
> To: Cisco certification
> Subject: ISIS --- advertise passive-only
>
> Hi Group,
>
> I was looking for a feature in ISIS where I could suppress
> the networks of connected interfaces toward neighbour ISIS
> routers. I only wanted the loopback addresses advertised by
> the IGP so BGP would take care of the rest.
>
> It started off very well on my 1841 with 12.4(1a) loaded (There is no
> 12.2T) and what did I find?
>
> advertise Control which IP routes flow in L1 and L2 LSPs
> R8(config-router)#advertise ?
> passive-only only interface address of passive interfaces
> R8(config-router)#advertise passive-only ?
> <cr>
> R8(config-router)#advertise passive-only
>
> And this works like a charm:
>
> R8.00-00 0x000000F1 0x71DB 993
> 0/0/0
> Auth: Length: 7
> Area Address: 10
> NLPID: 0xCC
> Hostname: R8
> IP Address: 10.100.100.8
> Metric: 0 IP 10.100.100.8 255.255.255.255
> Metric: 10 IS R8.02
> Metric: 10 IS R8.01
> R8.01-00 0x000000E9 0xCFD7 1142
> 0/0/0
> Auth: Length: 7
> Metric: 0 IS R8.00
> Metric: 0 IS R9.00
>
> So I was slightly depressed when I discovered that the 12.2T
> release didn't have this feature or any other possibility to
> suppress advertised networks.
>
> It seems to me that "advertise passive-only" was really
> implemented for ISIS/BGP or ISIS/MBGP combos for larger ISP
> backbone networks.
>
> Or is there another way of only advertising your loopbacks over ISIS?
>
> Cheers,
>
> Danny
>
>
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