12-05-2002 05:27 AM - edited 03-02-2019 03:23 AM
Max EBGP hops is 255.
In a confederation AS, do the member AS numbers count as part of the AS path i.e. does the 255 max include confederation ASs ?
12-05-2002 06:10 AM
EBGP hops are counted by router hops, not AS hops. So, yes confederation AS members would be counted, as would any router.
Hope this helps,
Don
12-07-2002 03:25 AM
Let me rephrase the question:
The AS_Path attribute is up to 255 AS entries in length. If the AS path contains confederation AS numbers, are they counted as part of the 255 ?
12-07-2002 04:59 PM
Yup, they are included when checking for the maximum lenght. Keep in mind that when the prefix leaves the confed, the confereration info is stripped. But yes, if you got a prefix with an AS path lenght of 253 and then the prefix transited 2 confederations, you would have to make the prefix as invalid.
12-08-2002 03:07 AM
Good answer Warren; thanks
12-05-2002 06:18 AM
From the IOS, IP routing command index, located at:
neighbor ebgp-multihop
To accept and attempt Border Gateway Protocol (BGP) connections to external peers residing on networks that are not directly connected, use the neighbor ebgp-multihop router configuration command. To return to the default, use the no form of this command.
neighbor {ip-address | peer-group-name} ebgp-multihop [ttl]
no neighbor {ip-address | peer-group-name} ebgp-multihop
Syntax Description
ip-address
IP address of the BGP-speaking neighbor.
peer-group-name
Name of a BGP peer group.
ttl
(Optional) Time-to-live in the range 1 to 255 hops.
-----
This means that the hops are actually the TTL of the IP packets.
If you don't know what TTL is, then you should be reading more TCP/IP
protocol suite books.
BR,
Zvezdelin
12-08-2002 03:04 AM
Thanks for the answer but you misunderstood my question. It wasn't about TTL or router hops, it was about ASs.
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