Dear Emanuel does the document you sent apply for 7606 ? because i didnt found the device
thanks a lot for your assistance > Date: Thu, 6 May 2010 12:43:14 +0300 > Subject: Re: [c-nsp] FW: Overruns > From: [email protected] > To: [email protected] > CC: [email protected] > > One more thing that comes to mind: load-balancing algorithm for > ether-channels with 5 links on Cisco 7600 is pretty tricky: > http://www.cisco.com/en/US/tech/tk389/tk213/technologies_tech_note09186a0080094714.shtml > > This means that on an ether-channel with 5 GE links, considering the > hashing algorithm documented by Cisco and good entropy, you will have: > - max. 1000Mbps on link #1 > - max. 1000Mbps on link #2 > - max. 1000Mbps on link #3 > - max. 500Mbps on link #4 > - max. 500Mbps on link #5 > - max. 4000Mbps (4Gbps) on the ether-channel > > So why not using only 4 links in the ether-channel instead of 5? > > Regards, > Manu > > > 2010/5/5 Mohammad Khalil <[email protected]>: > > 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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