its reachability to the access routers, this configuration can achieve a
significantly high level of reliability.
The configuration shown in example “b” is recommended when the
router can support both the layer 2 function and routing function. This
configuration would be expected to provide similar reliability to
configuration “a”.
The configuration shown in example “c” using a pair of routers
configured as a virtual router redundancy protocol (VRRP) pair can
provide reliability in networks in where SCTP multihoming capability
is not widely supported. If SCTP multihoming is widely supported,
operating the routers independent of each other would be preferable.
Some considerations when selecting a configuration are the
capabilities of the existing IP equipment, the desired level of
reliability, the provisioning effort, and cost.
System View
Architecture
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2-16
Lucent Technologies 235-200-118
Issue 3.02B, March 2007
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