[c-nsp] Preloading AS to static network entry via route-map: Duh?

[Keegan Holley]

Have you tried adding other attributes to the route map to see if they are
sent?  Most of my filtering is done per peer or per AS so I've honestly
never done it this way.  Syntax seems correct though.


On Mon, Jan 17, 2011 at 11:59 AM, Ramcharan, Vijay A <
vijay.ramcharan at verizonbusiness.com> wrote:

> 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
>  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: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> > bounces at puck.nether.net] On Behalf Of Elmar K. Bins
> > Sent: Monday, January 17, 2011 10:11 AM
> > To: cisco-nsp at puck.nether.net
> > 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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