To take full advantage of SRRP resiliency and diagnostic capabilities, the SRRP instance is tied to a MCS peering that terminates on the redundant node. After the peering is associated with the SRRP instance, MCS synchronizes the local information about the SRRP instance with the neighbor router. MCS automatically derives the MCS key for the SRRP instance based on the SRRP instance ID. An SRRP instance ID of 1 would appear in the MCS peering database with a MCS-key srrp-0000000001.
The SRRP instance information stored and sent to the neighbor router contains the following:
SRRP instance MCS key
service type and ID
subscriber IP interface name
subscriber subnet information
group IP interface information
SRRP group IP interface redundant IP interface name, IP address and mask
SRRP advertisement message SAP
local system IP address (SRRP advertisement message source IP address)
group IP interface MAC address
SRRP gateway MAC address
SRRP instance administration state (up or down)
SRRP instance operational state (disabled/becoming-backup/backup/becoming-master/ master)
current SRRP priority
remote redundant IP interface availability (available or unavailable)
local receive SRRP advertisement SAP availability (available or unavailable)