Hi, we use combinations of prepending and pref to adjust traffic away from devices that we are going to work on. As long as you're using soft changes there shouldn't be any disruption. There will obviously be rerouting and you need to be mindful of congestion if you do redirect large blocks of traffic but if done right it should be pretty transparent to the end user.
Thanks Scott On Jun 8, 2011, at 9:35 AM, Mark Mason wrote: > This post would be for those of you in a DC environment with multiple > internet feeds. When carrier X emails about a 12:00 - 6:00 maintenance window > for IOS upgrade, reboot, card swap, etc. are you influencing your eBGP > traffic away from that carrier during the maintenance window? Alternative > being DO NOTHING and take the hard outage of eBGP state dropping once and > quite possibly bouncing a number of times during maintenance. For those of > you who answer back with the first option (influence with prepend and local > pref) have you seen your external VPN connectivity drop and re-establish > during those changes? If my memory serves me right, in my prepending and > local pref changes, I have NOT seen connectivity impacted what so ever. > However, I HAVE seen connectivity impacted during maintenance hard eBGP state > changes. > > Mark Mason | Network Engineer, Adv | JHA Communications Infrastructure > Jack Henry & Associates, Inc.(r) | 417.235.6652 x1520 | > [email protected]<mailto:[email protected]> > > NOTICE: This electronic mail message and any files transmitted with it are > intended > exclusively for the individual or entity to which it is addressed. The > message, > together with any attachment, may contain confidential and/or privileged > information. > Any unauthorized review, use, printing, saving, copying, disclosure or > distribution > is strictly prohibited. If you have received this message in error, please > immediately advise the sender by reply email and delete all copies. > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/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/
