System information

BSR 64000 Configuration and Management Guide
7-14
• half-life —half-life period in minutes in the range 1 - 45. The default is 10. When
a BGP route has been assigned a penalty, the penalty is decreased by a half after
each half-life period (which is 15 minutes by default). Each time a route flaps, the
router configured for route flap damping assigns the route a penalty. Penalties are
cumulative. BGP stores the penalty for all reachable and unreachable routes that
have experienced recent flaps.
• reuse — reuse limit in the range 1 - 20000. The default is 750. As the penalty for
a flapping route decreases and falls below this reuse limit, the route is
unsuppressed. The route is added back to the BGP route table and used for
forwarding. The process of unsuppressing routers occurs in 10-second
increments. Every 10 seconds the router determines which routes are
unsuppressed and advertises them globally.
• suppress — the suppress limit in the range 1 - 20000. The default is 2000. A route
is suppressed when its penalty exceeds this limit.
• max-suppress-time — the maximum suppression time in minutes in the range 1 -
255. The default is four times the half-life. This value is the maximum amount of
time a route can be suppressed.
Policy-Based Routing
Policy-based routing routes network traffic by establishing protocol-independent data
paths. Policy-based routing provides a mechanism for forwarding data based on
policies defined by a network administrator. Policy-based routing also provides a
mechanism to mark packets so that certain kinds of traffic receive differentiated,
preferential service. Instead of routing by the destination address, policy-based
routing allows network administrators to implement routing policies that allow or
deny data paths based on the identity of a particular end system or a particular
application.