From: Gary Duncanson (gary.duncanson@googlemail.com)
Date: Fri Dec 07 2007 - 15:52:03 ART
Can you explain in a simple way what your problem actually is?
EBGP sessions from SW2 to Juniper routers flapping?
----- Original Message -----
From: "ccie ccie" <cciefun@gmail.com>
To: "Cisco certification" <ccielab@groupstudy.com>
Sent: Friday, December 07, 2007 5:42 PM
Subject: Real world Scnario...Need Help...Lossing $$$
> Hi Tech Lover,
>
> Juniper R1
> Juniper J2 <---- Connect to
> BB
> router as well as this router face the internet world.
> | | / / \ \
> | | <--- Each EBGP
> session with hello 2 Hold 6 running on each physical link. OPSF is also
> running on same link.
> Server Iron LB ======= 6500 sw1 ---ibgp---
> 6500 sw2 ====Server Iron LB
> | | / / \ \
> | | <--- Physical
> link are L2 port channel
> 4948 sw1 4948
> sw2
>
>
>
> This is an scnario, where i need your help. We cant run EBGP on loopback
> due to some architecturial concern. Problem with only EBGP session on core
> sw2.
>
> Our EBGP session only on core switch 2 with Juniper 1 & 2 flap with few
> irregular hours. IBGP session between core switch 1 & 2 never flap. We are
> get hell lot of traffic. This site run multicast ( but sure that could not
> be problem) servers, web server, DB server etc. Core sw1 session are
> always
> stable. OSPF neighborship on both switch to Juniper BB router is up snce
> more than 1 yrs.
>
> 1. BW on link is not high.
> 2. CPU show 99% spike when BGP falp. CPU cause BGP flap i think so. ( I
> dont
> think BGP flap can cause of CPU spike.)
> 3 Core switch is not having full BGP route.
>
> ( i tried to put ip nabr protocol-discover on EBGP link & session flap due
> to me, i revert back in few sec to save my job)
>
> Suggest an troubleshooting step. As usual TAC is already open & CISCO
> taking too much time.
>
> Regards,
> Mike
>
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