no , there is no congestion at all either in ingress or egress direction and the overruns vary from one individual physical link to another
> Date: Wed, 5 May 2010 13:05:42 +0300 > Subject: Re: [c-nsp] FW: Overruns > From: [email protected] > To: [email protected] > CC: [email protected] > > 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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