There are a few things to keep in mind when you configure a secondary address on an interface:
- any packet originated by the router (routing update, syslog, snmp, etc) and sent out that interface will use the primary address as the source address and not the secondary.
- if you run a dynamic routing protocol that establishes neighbor relationships (EIGRP, OSPF) they will form neighbor relationships on the primary address and not on the secondary address. (the dynamic routing protocol can advertise the secondary address if it matches a network statement, but can only form neighbor relationships on the primary).
- if you have multiple routers sharing a segment where you are configuring secondary addressing each of the routers needs to use the same subnet as the primary address.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...