[c-nsp] FW: Overruns

[Mohammad Khalil]

The cards are SFM-capable 48 port 10/100/1000mb
we connect 10 connections from each router to the ASN , each 5 are grouped together , 5 for VLAN that handle RAS to ASN communication and the other 5 to handle ASN to Core communication 

> Date: Tue, 4 May 2010 23:50:31 +0300
> Subject: Re: [c-nsp] FW: Overruns
> From: emanuel.popa at gmail.com
> To: eng_mssk at hotmail.com
> CC: cisco-nsp at puck.nether.net
> 
> hi mohammad,
> 
> what kind of linecards are you using? what capacity? how many links
> per ether-channel?
> 
> we had similar problems with overruns at ingress because of egress
> congestion. there are different workarounds for each setup. all
> problems are related to buffers and fabric connections though.
> 
> regards,
> manu
> 
> 
> 2010/5/4 Mohammad Khalil <eng_mssk at hotmail.com>:
> >
> > hi all
> >
> > i posted this issue earlier but didnt get a solution
> > anyway the MTU settings from both side are the same 1500 bytes
> > i dont think that the MTU modification from Cisco side as its related to the number of packets sent from the ASN side and received by the Cisco side
> > i was viewing the buffers on the Cisco side and found below
> > Public buffer pools:
> >
> > Huge buffers, 18024 bytes (total 2, permanent 2, peak 11 @ 5w5d):
> >     2 in free list (0 min, 4 max allowed)
> >     10062 hits, 182 misses, 364 trims, 364 created
> >     0 failures (0 no memory)
> >
> > do the misses number indicate anything ??
> > does the buffer tuning will solve the issue ?
> > even the IOS upgrade didn't solve the issue
> >
> > Thanks
> >
> > From: eng_mssk at hotmail.com
> > To: cisco-nsp at puck.nether.net
> > Subject: Overruns
> > Date: Tue, 6 Apr 2010 11:44:46 +0300
> >
> >
> >
> >
> >
> >
> >
> >
> > hi all
> >
> > i have 2 cisco 7606 routers connected to ASN GW for wimax traffic
> > we had a problem with overruns on the port channels
> > we connected 5 cables from the ASN to both routers and configured port channels for VLAN and the same setup for another vlan
> > one vlan is for communcations with RASs and one to transport the traffic for into the core cloud
> > anyway we upgraded the IOS version on the routers thinking thats might solve the issue but still
> > please find below
> >
> > CR1.KJ-Building#sh int po10 | inc over
> >     1 input errors, 1 CRC, 0 frame, 72395 overrun, 0 ignored
> > CR1.KJ-Building#sh int po20 | inc over
> >     6 input errors, 2 CRC, 0 frame, 734930 overrun, 0 ignored
> >
> > CR1.KJ-Building#sh run int po10
> > Building configuration...
> >
> > Current configuration : 259 bytes
> > !
> > interface Port-channel10
> >  description CORE_VLAN to ASN Gateway
> >  switchport
> >  switchport access vlan 10
> >  switchport trunk encapsulation dot1q
> >  switchport mode access
> >  load-interval 30
> >  speed 1000
> >  duplex full
> >  flowcontrol receive on
> >  flowcontrol send on
> > end
> >
> > CR1.KJ-Building#sh run int po20
> > Building configuration...
> >
> > Current configuration : 258 bytes
> > !
> > interface Port-channel20
> >  description RAS-VLAN to ASN Gateway
> >  switchport
> >  switchport access vlan 20
> >  switchport trunk encapsulation dot1q
> >  switchport mode access
> >  load-interval 30
> >  speed 1000
> >  duplex full
> >  flowcontrol receive on
> >  flowcontrol send on
> > end
> >
> > CR2.KJ-Building#sh int po10 | inc over
> >     0 input errors, 0 CRC, 0 frame, 17889 overrun, 0 ignored
> > CR2.KJ-Building#sh int po20 | inc over
> >     0 input errors, 0 CRC, 0 frame, 826604 overrun, 0 ignored
> >
> > CR2.KJ-Building#sh run int po10
> > Building configuration...
> >
> > Current configuration : 259 bytes
> > !
> > interface Port-channel10
> >  description CORE_VLAN to ASN Gateway
> >  switchport
> >  switchport access vlan 10
> >  switchport trunk encapsulation dot1q
> >  switchport mode access
> >  load-interval 30
> >  speed 1000
> >  duplex full
> >  flowcontrol receive on
> >  flowcontrol send on
> > end
> >
> > CR2.KJ-Building#sh run int po20
> > Building configuration...
> >
> > Current configuration : 258 bytes
> > !
> > interface Port-channel20
> >  description RAS-VLAN to ASN Gateway
> >  switchport
> >  switchport access vlan 20
> >  switchport trunk encapsulation dot1q
> >  switchport mode access
> >  load-interval 30
> >  speed 1000
> >  duplex full
> >  flowcontrol receive on
> >  flowcontrol send on
> > end
> >
> > any advice in regards
> > thanks
> >
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