17.01.2011 18:59, Ramcharan, Vijay A пишет:
I've never used that method to do as-prepending but I tried it in a lab
and it didn't work. Perhaps I'm missing something as well.
Reading the BGP-4 handbook by Parkhurst, page 250 says that "In theory,
these commands allow you to modify a network's BGP attributes. In our
experience, they are too buggy and should not be used."
I used the same route-map in a neighbor statement and it as-prepended as
expected.
router bgp 2
bgp log-neighbor-changes
neighbor 10.0.50.4 remote-as 4
neighbor 10.0.50.5 remote-as 5
!
address-family ipv4
neighbor 10.0.50.4 activate
neighbor 10.0.50.4 route-map asprepend out ===> WORKS
neighbor 10.0.50.5 activate
no auto-summary
no synchronization
network 1.1.1.0 mask 255.255.255.0 route-map asprepend ===> Doesn't do
anything
AFAIK, as-path prepend works only on eBGP sessions, but not on iBGP.
Network origination like iBGP in some way. In this route-map you can set local
preference,
or add communities attributes, etc.
exit-address-family
!
route-map asprepend permit 10
set as-path prepend 2 2 2
!
Downstream-2600-4#show ip bgp
BGP table version is 19, local router ID is 10.0.50.4
Status codes: s suppressed, d damped, h history, * valid,> best, i -
internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
* 1.1.1.0/24 10.0.50.2 0 0 2 2 2 2 i
*> 10.0.0.5 0 1 5 2 i
Downstream-2600-4#
Vijay Ramcharan
-----Original Message-----
From: [email protected] [mailto:cisco-nsp-
[email protected]] On Behalf Of Elmar K. Bins
Sent: Monday, January 17, 2011 10:11 AM
To: [email protected]
Subject: [c-nsp] Preloading AS to static network entry via route-map:
Duh?
Re guys,
the prefixes I give out are being rooted by "network" entries with
a route-map attached (like "network a.b.c.d/e route-map<rm>").
In that route-map, I'm simply prepending an ASN ("as-path prepend
<as>").
Well - that prepend never makes it to the outside world. Source ASN is
simply my ASN, the desired<as> is nowhere to be found.
Am I wrong in assuming it should work that way?
Oh, platform is an ASR1002, IOS-XE 12.2(33)XNC1t.
Didn't try my 7301s yet...
Elmar.
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--
Sincerely yours,
Artyom Viklenko.
-------------------------------------------------------
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