[c-nsp] Quick question regarding BGP route churn & PRP-2

[Dumitru Ciobarcianu]

Hi,

You could try to enable bgp dampening.

Dumitru


On 07-Mar-13 3:20 PM, Drew Weaver wrote:
> Howdy,
> 
> One of our routers in a smaller facility is still rocking a pair of PRP-2s and we've been getting notices lately that it has been failing to respond to SNMP queries.
> 
> Makes sense, as my cell phone likely has a better CPU than the PRP-2 but I wanted to see if there was any way to extend the life of this thing just a little longer.
> 
> I tracked the CPU usage and it appears that the BGP ROUTER process is what is eating all of the CPU time when this issue happens.
> 
> There seems to be a constant deadly drip of routing updates coming in from one of the upstream providers attached to this router:
> 
> The below were taken just 1 second apart:
> 
> Neighbor        V           AS MsgRcvd     MsgSent   TblVer        InQ OutQ Up/Down  State/PfxRcd
> x.x.x.13          4        3356 164983466 1610722 334466344   13    0            4w2d       434626
> 
> Neighbor        V           AS MsgRcvd     MsgSent   TblVer        inQ OutQ Up/Down  State/PfxRcd
> x.x.x.13          4        3356 164983671 1610725 334466843    0     0             4w2d       434664
> 
> Neighbor        V           AS MsgRcvd     MsgSent   TblVer        InQ OutQ Up/Down  State/PfxRcd
> x.x.x.13          4        3356 164983700 1610725 334466843    0    0              4w2d       434674
> 
> We have only been getting the notices that SNMP is failing 2-3 times a day out of 480 pollings but it's enough to cause alerts and operational events to be created, etc.
> 
> Awhile back we had a problem with another upstream where it would take an hour sometimes to download the full table from them so we implemented PMTUD which helped in that scenario; the max data segment size on this particular neighbor appears to be 1460 bytes.
> 
> Does anyone have any tips or tricks on ways to lessen the impact of the constant route churn aside from either "Don't use a PRP-2 because it sucks" or "don't import a full table".
> 
> We're already scheduled to be upgrading to ASR9000s with RSP440s fairly soon but like I said I do need to squeeze out just a few more months on this beastie.
> 
> This particular router is still running IOS and hasn't been upgraded to XR.
> 
> Thanks!
> -Drew
> 
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