Chassis Redundancy
The concentrators support two general types of redundancy: intra- and inter-chassis redundancy. Intra-chassis redundancy is available on the 3015 concentrators and higher, where dual power supplies and redundant SEP cards are supported. All of the Cisco concentrators, however, support inter-chassis redundancy through one of two solutions:
Virtual Router Redundancy Protocol (VRRP)
Virtual Cluster Agent (VCA), sometimes referred to as Remote Access Load Balancing
Both are mutually exclusive. You can use one or the other; both have advantages and disadvantages. For example, VRRP, because it is a standard, can be used to provide redundancy using concentrator and nonconcentrator products (such as Cisco routers); however, VRRP does ...
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