Cisco Router IOS XR Manuale Utente Scaricare il pdf (Pagina 67)

Cisco IOS XR Training Page 67

Here is the first difference with IOS XR – eBGP peers must have a Route-

Policy (route-map) configured to permit routes in and out of them.

Instead of a route-map like IOS, IOS XR uses a Route Policy Language (RPL) –

that is more powerful and easier than IOS. Let’s configure a very simple one

to pass everything:

RP/0/7/CPU0:R1(config)#route-policy PASS

RP/0/7/CPU0:R1(config-rpl)#pass

RP/0/7/CPU0:R1(config-rpl)#exit

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

Thu Mar 29 23:28:08.400 UTC

Cool – that was easy. Now lets apply that to the eBGP neighbor:

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

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

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

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

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

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

Thu Mar 29 23:28:32.865 UTC

Now, lets look at the routing table for BGP

RP/0/7/CPU0:R1#sh route ipv4 bgp

Thu Mar 29 23:29:43.865 UTC

B 200.200.200.200/32 [20/0] via 2.2.2.2, 00:01:06

RP/0/7/CPU0:R1#

Cool, we have a route to R2’s Loopback100 interface. PING time!

RP/0/7/CPU0:R1#ping 200.200.200.200 sou loop100

Thu Mar 29 23:30:10.013 UTC

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 200.200.200.200, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 2/3/5 ms

RP/0/7/CPU0:R1#

Look at that, we have connectivity!

A similar IOS config would look like this:

router /jointfilesconvert/356165/bgp 1

no synchronization

/jointfilesconvert/356165/bgp log-neighbor-changes

network 100.100.100.100 mask 255.255.255.255

neighbor 2.2.2.2 remote-as 2

neighbor 2.2.2.2 e/jointfilesconvert/356165/bgp-multihop 255

neighbor 2.2.2.2 route-map PASS in

neighbor 2.2.2.2 route-map PASS out

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Cisco Router IOS XR Manuale Utente Pagina 67