From: Ronald van Dommelen (Ronald.v.Dommelen@Nobel.NL)
Date: Wed Oct 15 2003 - 10:39:05 GMT-3
Hi Ken,
I think your first route-map is OK although I'm not sure (It's a good
question) if this route-map is nessecary since it has a longer AS-PATH
and BGP can see he's the originating AS.
Also within you neighbor statement for neigh 22.22.22.22 (I presume this
is router 2) you do not need ebgp-multihop command since its iBGP...
That gonna cost you points on your exam ... ;-)
Cheers Ronald
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Ken.Farrington@barclayscapital.com
Sent: woensdag 15 oktober 2003 13:14
To: ccielab@groupstudy.com
Subject: BGP Route-Map Question.
+--------------+
| 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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