Guys, Can ASIC oversubscription cause the switch to unicast out all ports for that ASIC?
I am still seeing some unicast traffic hitting ports where it shouldn't be. Cheers, Aaron. On Thu 15/07/10 12:27 AM , Benjamin Lovell <[email protected]> wrote: > Depending on the number of connected IP addresses this can be an issue. > This is why in most cases it will be better to bring up the MAC table > timers as opposed to bring down the ARP timers. > > -Ben > > On Jul 14, 2010, at 11:16 AM, Jon Lewis wrote: > > > On Wed, 14 Jul 2010, Phil Mayers wrote: > > > >>> mac-address-table aging-time 14400 > >>> http://www.ciscopress.com/articles/article.asp?p=336872 [1] > >> > >> Or of course drop the ARP timeout: > >> > >> int VlanX > >> arp timeout 290 > > > > I haven't tracked down the exact issue, but we've seen issues when > using too short an arp timeout on a 6500 vlan interface. Sometimes > customers will ask for really short arp timeouts to cope with failover > systems that change an IPs MAC address. > > > > The vlan in question had an arp timeout of 60s and had a couple of KVM > servers with 100 or so virtual machines. Especially when a large number of > VMs started up, we'd see periods of packet loss. My assumption is that the > sup720-3bxl can only handle so much arp activity on a vlan. There was > nothing in the config to artificially limit arp traffic. > > > > ---------------------------------------------------------------------- > > Jon Lewis | I route > > Senior Network Engineer | therefore you are > > Atlantic Net | > > _________ http://www.lewis.org/~jlewis/pgp [2] for PGP public > key_________ > > _______________________________________________ > > cisco-nsp mailing list [email protected] > > https://puck.nether.net/mailman/listinfo/cisco-nsp [3] > > archive at http://puck.nether.net/pipermail/cisco-nsp/ [4] > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp [5] > archive at http://puck.nether.net/pipermail/cisco-nsp/ [6] > > > > Links: > ------ > [1] > http://webmail.amnet.net.au/parse.php?redirect=http://www.ciscopress.com/ar > ticles/article.asp%3Fp%3D336872[2] > http://webmail.amnet.net.au/parse.php?redirect=http://www.lewis.org/%7Ejlew > is/pgp[3] > http://webmail.amnet.net.au/parse.php?redirect=https://puck.nether.net/mail > man/listinfo/cisco-nsp[4] > http://webmail.amnet.net.au/parse.php?redirect=http://puck.nether.net/piper > mail/cisco-nsp/[5] > http://webmail.amnet.net.au/parse.php?redirect=https://puck.nether.net/mail > man/listinfo/cisco-nsp[6] > http://webmail.amnet.net.au/parse.php?redirect=http://puck.nether.net/piper > mail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
