From: Sergio Jimenez Arguedas (sejimenez@its.co.cr)
Date: Sat Mar 13 2004 - 20:30:39 GMT-3
Hi Shibu,
Syncronization:
If one of the following conditions are true the sync can be disabled,
1.All routers in the AS that transit traffic might take care running BGP.
2.The AS will not be a trasit AS.
***Note: 99% of the world has sync disabled***
A_Syncronization ON: In all the routers of the AS.
B_Syncronization OFF: In all the routers fo the AS.
Do you know that rule?
C_Syncronization ON / BGP&OSPF:
"OSPF RID`s, BGP RID`s, The rule of syncronization and Route Reflectors"
Rgds,
Sergio Jiminez A.
----- Original Message -----
From: "Shibu Nair" <shinair@cisco.com>
To: <ccielab@groupstudy.com>
Sent: Saturday, March 13, 2004 2:57 PM
Subject: BGP no sync
> Hi
> Setup:
> R5-----ibgp------R2-----ebgp-------R6
>
> R5 have a loopback 200 configured for 200.200.200.5/24
> And advertised through BGP as well as OSPF.
> R5 and R6 have "no sync" configured. And R2 did not disabled
> the sync.
>
> R2 installed OSPF route (200.200.200.0/24) in the routing table but
> i can also see the same route under bgp table aslo. And due to the
> smaller adm distance, OSPF is installed in the routing table.
>
> R2#sh ip bgp
> BGP table version is 5, local router ID is 2.2.2.2
> Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal
> Origin codes: i - IGP, e - EGP, ? - incomplete
> Network Next Hop Metric LocPrf Weight Path
> * >i200.200.200.0 5.5.5.5 0 100 0 i
>
> R2 to R6 is ebgp and i can see eBGP route is added in the routing table
> (since ebgp
> have lower admin distance than OSPF). Both show ip route and show ip bgp
> shows the
> 200.200.200.0/24 routes. I think here everything is workig as expected.
>
> Now my question is about the sync,
> If i have to disable sync on one router, is it a good practice to disable
> on all the routers
> or it does not matter as long as IGP is learned the routes before BGP
> install in the routing table.
>
> Any other tips that i should know when "sync" has to be disabled on one or
> all the ebgp/ibgp routers.
> Thank you
> Regards
> Shibu
>
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