We have a pair of CSS (model 11503) configured as an active/standby pair using redundant VIPs and interfaces. Each CSS has connections to the same four subnets for which one CSS is the Master and the other Backup.
This all works fine but when I recently connected another gigabit interface on each CSS to a new subnet, the two CSS failed to see each other and both came up as Master. To eliminate the switches they were connected to as the possible cause, I reconnected them to a single standalone switch but the same problem resulted. The CSS could not ping each others interface either. I think it could be something to do with ARP entries and collected the information below.
Each router will send packets whose destination IP address equals the VIP to its attached switch, using the MAC address as advertised by the master. When a backup receives such a packet, it will process the packet according to the content rules configured for the VIP and not forward the packet to the master. In order for this to work, there cannot be a shared L2 infrastructure in front of or behind the CSS.
This document is an early notification of a behaviour change that will be introduced in IOS XR release 6.5.
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