From: Justin Menga (Justin.Menga@xxxxxxxxxxxxxxxxxx)
Date: Sun Dec 10 2000 - 08:24:00 GMT-3
Synchronisation means the BGP route IS IN THE ROUTE TABLE (i.e. show ip
route, and the BGP routes are listed via some other means (e.g. OSPF
redistribution). Next Hop is not part of the synch algorithm - next hop is
ALWAYS evaluated, even if synch is turned off.
Your BPG routes shown are not in the IGP table so your BGP routes aren't
synched - they will not be advertised to any EBGP peers until they somehow
appear in the IGP table.
To verify, do a show ip bgp 206.100.20.16
This will tell you if the route is synchronized or not.
-----Original Message-----
From: Robert DeVito [mailto:robertdevito@hotmail.com]
Sent: Sunday, December 03, 2000 5:44 AM
To: ccielab@groupstudy.com
Subject: BGP Sync Question
I have a question about BGP Sync...
If I do a "show ip bgp" I see the following:
Network Next Hop Metric LocPrf Weight Path
*>i206.11.20.16/29 192.168.4.1 0 100 0 300 i
*>i206.11.20.64/29 192.168.4.1 0 100 0 300 i
Now if I do a "show ip route" I see the following:
Gateway of last resort is not set
10.0.0.0/16 is subnetted, 4 subnets
R 10.2.0.0 [120/2] via 192.168.1.2, 00:00:19, Ethernet0
R 10.3.0.0 [120/1] via 192.168.1.2, 00:00:19, Ethernet0
C 10.4.0.0 is directly connected, Loopback0
R 10.5.0.0 [120/2] via 192.168.1.2, 00:00:19, Ethernet0
C 192.168.1.0/24 is directly connected, Ethernet0
R 192.168.2.0/24 [120/1] via 192.168.1.2, 00:00:19, Ethernet0
R 192.168.3.0/24 [120/1] via 192.168.1.2, 00:00:19, Ethernet0
R 192.168.4.0/24 [120/2] via 192.168.1.2, 00:00:19, Ethernet0
C 192.19.15.0/24 is directly connected, Serial1
As you can see I know how to get to the next hop of the two BGP learned
route, if I do not turn sync off I do not see the routes in my routing
table, why? I thought if you have a "*>" next to your route, I should see it
in my routing table and it complies with the rules of BGP sync?
Thank you!
Robert DeVito
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