From: ccie ccie (cciefun@gmail.com)
Date: Sat Dec 08 2007 - 00:01:37 ART
Hi All,
What SUP are you running on the 6500's? ==> Sup 720
how much memory? Not in office need to check that but sure more more than
128MB. They have set good standard for memory/enggeering IOS etc.
What does "sh proc cpu" look like? EBGP hold time expire (hello 2 , hod
time is 6sec) & its come up immegiately. In "sh proc cpu his" the flap time
matches to cpu spike. CPU spike when flap happen mostly between 97-99% only
for few second.
Are you getting any log messages on your switch (e.g. are you SURE you
aren't getting full routes or trying to?)--Only default BGP route from
Juniper router.
What i have checked,
1. BW on link to Juniper & Core sw 2 is OK
2. CPU is 20% all time mostly
3. Log all clear except BGP hold timer expire when flap
4. No input output interface drop on Core sw2 to juniper interface
5. IBGP session between both switches, never falp. Only EBGP session flap
with BOTH juniper. ( So juniper is not culprit as usual.)
6. I suspect some kind of traffic from LAN or WAN hitting causing the few
second spike in CPU which turn to EBGP session flap on core switch 2. My
observation in all DC of my company, whenever the CPU hits to 97-99% only
EBGP session flap & IBGP as well as OSPF keep clam.
The reason EBGP flap is due to MTU mismatch on uplink that is also not
there.
Thanks in advance for any kind on help.
Regards,
Mike
On 12/8/07, Scott Morris <smorris@ipexpert.com> wrote:
>
> What SUP are you running on the 6500's? how much memory? What does "sh
> proc cpu" look like? Are you getting any log messages on your switch (
> e.g.
> are you SURE you aren't getting full routes or trying to?)
>
> Scott
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto: nobody@groupstudy.com] On Behalf Of
> ccie
> ccie
> Sent: Friday, December 07, 2007 12:42 PM
> To: Cisco certification
> 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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