[c-nsp] FW: Overruns

[Emanuel Popa]

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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