From: Danny Muizebelt (Danny.Muizebelt@osiatis.at)
Date: Thu Oct 20 2005 - 08:13:17 GMT-3
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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