Sorry. I'm not very familiar with that kind of linecards. Only using LAN cards 67xx with DFC modules.
However, when we encountered overruns we had 2 options: 1. easy one: enable "fabric clear-block"; this will get rid of overruns but will drop packets in fabric which is gonna be harder to detect; the fabric is only going to internally prioritize CoS 5 with older IOS versions; with newer versions might be another story; never tested though 2. more difficult: "ingress queuing" is necessary to overrun only packets you afford to drop, but can be done only with CoS and 802.1q configured on your ether-channels Anyways, is there any congestion at the egress in your router that is causing the overruns in the first place? Or is this a different problem than what we experienced? Regards, Manu 2010/5/5 Mohammad Khalil <[email protected]>: > 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: [email protected] >> To: [email protected] >> CC: [email protected] >> >> 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 <[email protected]>: >> > >> > 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: [email protected] >> > To: [email protected] >> > 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 >> > >> > Hotmail: Powerful Free email with security by Microsoft. 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