Cisco Router IOS XR Bedienungsanleitung PDF herunterladen (Seite 70)

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Now that we have the policy committed with no errors, we can apply it to the

neighbor. We could have waited to commit, but I chose to commit there to

make sure all was OK.

RP/0/7/CPU0:R1(config)#router /jointfilesconvert/356165/bgp 1

RP/0/7/CPU0:R1(config-/jointfilesconvert/356165/bgp)#neighbor 2.2.2.2

RP/0/7/CPU0:R1(config-/jointfilesconvert/356165/bgp-nbr)#address-family ipv4 un

RP/0/7/CPU0:R1(config-/jointfilesconvert/356165/bgp-nbr-af)#route-policy R2Loopbacks in

RP/0/7/CPU0:R1(config-/jointfilesconvert/356165/bgp-nbr-af)#exit

RP/0/7/CPU0:R1(config-/jointfilesconvert/356165/bgp-nbr)#exit

RP/0/7/CPU0:R1(config-/jointfilesconvert/356165/bgp)#exi

RP/0/7/CPU0:R1(config)#commit

Fri Mar 30 13:27:01.945 UTC

RP/0/7/CPU0:R1(config)#

Now, lets look at our BGP routing table:

RP/0/7/CPU0:R1#sh ip route /jointfilesconvert/356165/bgp

Fri Mar 30 13:27:22.601 UTC

B 200.100.200.100/32 [20/0] via 2.2.2.2, 00:14:28

RP/0/7/CPU0:R1#

There we go, only getting the 200.100.200.100/32 from R2 now.

In IOS this would have looked like:

R1(config)#ip prefix-list R2Loopbacks permit 200.100.200.100/32

R1(config)#route-map R2Loopbacks

R1(config-route-map)#match ip add prefix-list R2Loopbacks

R1(config-route-map)#exit

R1(config)#router /jointfilesconvert/356165/bgp 1

R1(config-router)#nei 2.2.2.2 route-map R2Loopbacks in

R1(config-router)#^Z

R1#sh ip route b

*Mar 30 14:08:53.048: %SYS-5-CONFIG_I: Configured from console by console

(After a few minutes waiting for BGP)

R1#sh ip route /jointfilesconvert/356165/bgp

200.100.200.0/32 is subnetted, 1 subnets

B 200.100.200.100 [20/0] via 2.2.2.2, 00:00:20

R1#

While that might not be so bad, the power of RPL grows. This is just a quick

intro; future posts will have more and more about RPL. Some other things that

we might see are:

route-policy check ASPath

if as-path passes-through ‘65500’ then

drop

else

pass

endif

end-policy

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