From: Scott Morris (swm@emanon.com)
Date: Thu Oct 20 2005 - 09:54:08 GMT-3
You can also use passive-interface to bring the route into the RIB without
generating any packets on the interface.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
McCallum, Robert
Sent: Thursday, October 20, 2005 8:15 AM
To: Danny Muizebelt; Cisco certification
Subject: RE: ISIS --- advertise passive-only
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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