From: Hobbs (deadheadblues@gmail.com)
Date: Sun Jul 13 2008 - 02:22:36 ART
Hello Groupstudy,
R6 and R5 are EBGP peers
R6 in AS 65000, R5 is AS 345
R6 has 4 loopback networks:
6.0.0.0/24
6.0.1.0/24
6.0.2.0/24
6.0.3.0/24
R6 has this prefix-list and route-map:
!
ip prefix-list LOOPS seq 5 permit 6.0.2.0/24
ip prefix-list LOOPS seq 10 permit 6.0.3.0/24
!
route-map TEST permit 10
match ip address prefix-list LOOPS
continue 20
set as-path prepend 65200
!
route-map TEST permit 20
set metric 200
R6 applies this route-map to R5, but this is what R5 has:
R5#show ip bgp | begin Net
Network Next Hop Metric LocPrf Weight Path
*> 6.0.0.0/24 172.14.45.6 200 0 65000 i
*> 6.0.1.0/24 172.14.45.6 200 0 65000 i
*> 6.0.2.0/24 172.14.45.6 0 0 65000 65200 i
*> 6.0.3.0/24 172.14.45.6 0 0 65000 65200 i
Shouldn't all routes have metric 200 since clause 20 has no match?
Here is my logic, correct me if I am wrong:
-statement 10 evaluated
-prepend of 65200 added to matching routes
-continue clause causes matching routes to be evaluated again by clause 20
-no match in clause 20 causes all routes to get metric of 200
For 2nd test, I changed route-map to this, thinking an additional match
statement was needed:
!
route-map TEST permit 10
match ip address prefix-list LOOPS
continue 30
set as-path prepend 65200
!
route-map TEST permit 20
set metric 200
!
route-map TEST permit 30
match ip address prefix-list LOOPS
set metric 300
!
But again no metric for routes in the LOOPS prefix-list:
R5#show ip bgp | begin Net
Network Next Hop Metric LocPrf Weight Path
*> 6.0.0.0/24 172.14.45.6 200 0 65000 i
*> 6.0.1.0/24 172.14.45.6 200 0 65000 i
*> 6.0.2.0/24 172.14.45.6 0 0 65000 65200 i
*> 6.0.3.0/24 172.14.45.6 0 0 65000 65200 i
I made sure to clear bgp after each changed. Even doing a hard bgp reset to
make sure.
Am I missing something?
Am I misunderstanding the way this is supposed to work?
Here is the reference I am using:
http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/irp_bgp_external_sp_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1056446
thank you
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