From: Gopala Naganab (netlanceconsulting@xxxxxxxxx)
Date: Sat Nov 04 2000 - 16:54:34 GMT-3
Dave,
As per your setup: R1 should have 2 entries(local prf
100, 300) and R2 shd have one entry(local prf 300) for
172.16.1.0. R1 will have updates fm R2 and R3. R2 will
have updates fm R4 only.
R1 will recv updates fm R2 and R3. R1 installs route
fm R2 in its route table(higher local pref). Having
installed the route fm R2, R1 will not send update(for
172.16.1.0) to R2(against split-horizon).
Hope i am clear. feel free to ask questions if
unclear.
Gopal, CCIE#6209
--- dave.awatere@equant.com wrote:
>
>
> Hi all,
>
> I am trying to control the exit point to 2 different
> /24 nets in an external AS
> using local-pref. It seems to work OK but I am
> hoping there is a "tidier" way.
>
> Also, on my AS1 iBGP routers (lots of them) when I
> do show ip bgp 172.16.1.0
> there is only one entry (pref300). I am sure there
> should be the second pref
> 100 route in the table with no >. If I shut one of
> the exit points and clear ip
> bgp *, the pref 100 replaces the lost 300 but I
> still think both entrys should
> exist when show ip bgp net.
>
>
R1---------------------------iBGP----------------------------R2
> |
> |
> |
> | AS1
>
-------------------------------------------------------------------------------
-----------------------------
> |
> | AS2
> |
> |
>
R3---------------------------iBGP----------------------------R4
>
> AS2 networks:
> 172.16.1.0/24
> 172.16.2.0/24
>
>
> **************************************************
> R1
> router bgp 1
> neighbor AS2 route-map LOCAL in
> !
> access-list 1 permit any
> access-list 25 permit 172.16.2.0 0.0.0.255
> !
> route-map LOCAL permit 10
> match ip address 25
> set local-preference 300
> !
> route-map LOCAL permit 20
> match ip address 1
> set local-preference 100
> **************************************************
> R2
> router bgp 1
> neighbor AS2 route-map LOCAL in
> !
> access-list 1 permit any
> access-list 25 permit 172.16.1.0 0.0.0.255
> !
> route-map LOCAL permit 10
> match ip address 25
> set local-preference 300
> !
> route-map LOCAL permit 20
> match ip address 1
> set local-preference 100
> ***************************************************
>
> R\Davo
>
>
>
>
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