From: AP (ccie2b@mailandnews.com)
Date: Wed Oct 15 2003 - 19:36:26 GMT-3
true, as-set will not help, result of too much thinking on my end :-)
since aggregate is originated from AS1 (AS_PATH attribute will always have
_1$), shouldn't BGP loop detection mechanism automatically take care of it, if
this prefix ever make back to AS1.
Do we need a route-map in this scenario, maybe I am missing something.
Thanks
AP
>===== Original Message From "Volkov, Dmitry (IDS Canada)"
<dmitry_volkov@ml.com> =====
>How would "as-set" help here ?
>R2 & R1 are in the same AS.
>
>> -----Original Message-----
>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>> ccie2b@mailandnews.com
>> Sent: Wednesday, October 15, 2003 5:41 PM
>> To: ccielab; Ken.Farrington@barclayscapital.com
>> Subject: RE: BGP Route-Map Question.
>>
>>
>> Can as-set be used in this case instead of route-map:
>>
>> aggregate-address 142.220.0.0 255.255.0.0 summary-only as-set
>>
>> - AP
>>
>> >===== Original Message From Ken.Farrington@barclayscapital.com =====
>> >+--------------+
>> >| AS1 |
>> >| +----+ |
>> >| | R2 | |
>> >| +----+ |
>> >| | |
>> >| | |
>> >| | |
>> >| +----+ |
>> >| | R1 | |
>> >| +----+ |
>> >| | |
>> >+------|-------+
>> > |
>> >+------|--------+
>> >| +----+ |
>> >| | R3 | |
>> >| +----+ |
>> >| AS2 |
>> >+---------------+
>> >
>> >
>> >Simple BGP Scenario/
>> >
>> >I have multiple routes being asvertised via BGP from R2
>> throught the ASs
>> >I want to summarise the routes to one single route on R1 so
>> it advertises
>> >as summary to R3 in AS2.
>> >
>> >I also, want to stop this summary from being advertised back
>> into AS1.
>> >I can do this with a neighbor route map, but which route-map
>> is correct.
>> >
>> >They both work, and I am panicing becuase what they may ask
>> in the lab, I
>> >may do
>> >one way and they expect another.
>> >
>> >
>> >Many thx in advanced for any tips
>> >Ken
>> >
>> >
>> >!
>> >router bgp 620
>> > no synchronization
>> > bgp log-neighbor-changes
>> > bgp confederation identifier 600
>> > aggregate-address 142.220.0.0 255.255.0.0 summary-only
>> > neighbor 22.22.22.22 remote-as 620
>> > neighbor 22.22.22.22 ebgp-multihop 255
>> > neighbor 22.22.22.22 update-source Loopback0
>> > neighbor 22.22.22.22 route-map NO-SUMMARY out
>> > neighbor 33.33.33.33 remote-as 500
>> > neighbor 33.33.33.33 ebgp-multihop 255
>> > neighbor 33.33.33.33 update-source Loopback0
>> >!
>> >access-list 18 permit 142.220.0.0
>> >!
>> >route-map NO-SUMMARY deny 10
>> > match ip address 18
>> >!
>> >route-map NO-SUMMARY permit 20
>> >
>> >
>> >----------------or---------------------
>> >
>> >access-list 18 deny 142.220.0.0
>> >access-list 18 permit any
>> >
>> >!
>> >route-map DENY-SUMM permit 10
>> > match ip address 18
>> >!
>> >
>> >
>> >
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