nanog mailing list archives
Re: US patent 5473599
From: Nick Hilliard <nick () foobar org>
Date: Thu, 08 May 2014 12:00:00 +0100
On 08/05/2014 11:25, Henning Brauer wrote:
you shouldn't see issues but log spam.
maybe you misunderstand the problem. If you have vrrp and carp on the same vlan, using the same vrrp group ID as VHID, then each virtual IP will arp for the same mac address on that vlan. This messes up the switch's forwarding table for that particular vlan because it sees multiple entries from different ports for the same mac address. Switches will not do unicast replication in this situation, but instead will forward all traffic for a particular destination mac address to the port which announced the mac address most recently. In other words, this is much more serious than log spam: it is guaranteed to cause network downtime, because you cannot have two hosts on the same L2 domain using the same mac address, but doing different things. Nick
Current thread:
- Re: US patent 5473599, (continued)
- Re: US patent 5473599 Jared Mauch (May 06)
- Re: US patent 5473599 Constantine A. Murenin (May 06)
- Re: US patent 5473599 Owen DeLong (May 07)
- Re: US patent 5473599 Constantine A. Murenin (May 07)
- Re: US patent 5473599 Valdis . Kletnieks (May 07)
- Re: US patent 5473599 Constantine A. Murenin (May 07)
- Re: US patent 5473599 Blake Dunlap (May 07)
- Re: US patent 5473599 Laszlo Hanyecz (May 07)
- Re: US patent 5473599 Henning Brauer (May 08)
- Message not available
- Re: US patent 5473599 Henning Brauer (May 08)
- Re: US patent 5473599 Nick Hilliard (May 08)
- Re: US patent 5473599 Henning Brauer (May 08)
- Re: US patent 5473599 Nick Hilliard (May 08)
- Re: US patent 5473599 Geraint Jones (May 08)
- Re: US patent 5473599 Alain Hebert (May 08)
- Re: US patent 5473599 Henning Brauer (May 06)
- Re: US patent 5473599 Owen DeLong (May 07)
- Re: US patent 5473599 TGLASSEY (May 07)
- RE: US patent 5473599 Leo Vegoda (May 07)
- Re: US patent 5473599 David Conrad (May 07)
- Re: US patent 5473599 Matt Palmer (May 07)