Re: OT: Full BGP route table doing go slow down a router by

A couple of things to look out for once you've determined that that routing/route table are fine.

Look to see if your interfaces having and output or input queue drops. Any interface errors

Check your CPU on both routers. Any spikes? What's the average rate?

Look to see if you have any CEF related issue? Any CEF drops/punts etc?

How is your router tied into your network? Possible broadcast storms unrelated to your router or maybe even your client access to these routers may be the issue. Did you check all the links on the path?

What type of hardware is your router? Pending on your hardware, you may be experiencing hardware related issues.

Did you do a capture? Is all the traffic slow or just a particular use or site?

You see there are a lot of questions and areas to check for "user slowness".

On Dec 6, 2010, at 10:42 PM, William McCall <william.mccall_at_gmail.com> wrote:

> You'll have malloc failures and interesting problems that will most
> likely cause this packet forwarding device to cease performing its
> primary function.
>
> On 12/6/10, Rob Clav <robclav_at_gmail.com> wrote:
>> Hi,
>>
>> I had doubts about how to troubleshooting the following scenario.
>> "A company is dual homed using a couple of 10Mbps connections, but they are
>> complaining about a slow connection."
>> Well the scenario is two routers speaking iBGP with just one eBGP each. They
>> are using VRRP in order to be used as a default gateway by the internal
>> networks.
>>
>> Clue A: They have (almost) the global full BGP route, they are not learning
>> them for the IGP ("no sync").
>> Clue B: They are announcing only self generated prefixes(itself AS) and
>> receiving only from their peers(4 hops away using ebgp multihop).
>> Clue C: The service provider ensure there's no congestions on the lines and
>> the customer is using the 60% of the lines.
>> Clue D: No QoS in place
>> Clue E: There's several logs associated to incomming ACLs.
>> Last Clue: There's 15Mb free RAM allocable.
>>
>> The amount of the Ram at both routers are 256 Mb, the Cisco minimum RAM
>> amount, is 512Mb for full BGP table.
>>
>> Obviously the amount of RAM is an issue but, if the Ram is running out, then
>> the connection will go slow down or stop?
>>
>> Any comment will be appreciated,
>> Robclav
>>
>>
>>
>> --
>> Robert Clavero
>> CCIE RS/wr, CCNP, CCSP, CCSE NGX, SCSA 9, WLFES, BNP y JNCIA WX
>> blog:http://robclavbcn.blogspot.com
>>
>> web:http://www.kubsolutions.com
>>
>>
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>
> --
> Sent from my mobile device
>
> William McCall, CCIE #25044
>
>
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Received on Tue Dec 07 2010 - 11:20:38 ART