Brocade Network OS Administrator’s Guide v4.1.1 - Manual (Page 630)

When there is more than one route-reflector, they should all belong to the same cluster. By default, the
value for cluster-id is used as the device ID. However, the device ID can be changed:
switch(config-bgp-router)# cluster-id ipv4-address 10.30.13.4
switch(config-bgp-router)# cluster-id 2300
The route-reflector server reflects the routes as follows:
• Routes from the client are reflected to client as well as to nonclient peers.
• Routes from nonclient peers are reflected only to client peers.
In case route-reflector clients are connected in a full IBGP mesh, you may wish to disable client-to-
client reflection on the route reflector:
switch(config-bgp-ipv4u)# no client-to-client-reflection
A BGP device advertises only those routes that are preferred ones and are installed into the Routing
Table Manager (RTM). When a route could not be installed into the RTM because the routing table
was full, the route reflector may not reflect that route. In case the route reflector is not placed directly in
the forwarding path, you can configure the route reflector to reflect routes even though those routes
are not in the RTM:
switch(config-bgp-ipv4u)# always-propagate
Route flap dampening
Unstable routes can trigger a lot of route state changes. You can configure dampening in IPv4
address-family mode to avoid this churn by penalizing the unstable routes:
switch(config-bgp-ipv4u)# dampening
This command uses default values for the dampening parameters described below:
half-life
Number of minutes after which penalty for a route becomes half of its value. The route penalty allows
routes that have remained stable for a period despite earlier instability to become eligible for reuse
after the interval configured by this parameter. The decay rate of the penalty is proportional to the
value of the penalty. After the half-life expires, the penalty decays to half its value. A dampened route
that is no longer unstable can eventually again become eligible for use. You can configure the half-life
to be from 1 through 45 minutes. The default is 15 minutes.
reuse
Minimum penalty below which routes becomes reusable again. You can set the reuse threshold to a
value from 1 through 20000. The default is 750 (0.75, or three-fourths, of the penalty assessed for one
flap).
suppress
Maximum penalty above which route is suppressed by the device. You can set the suppression
threshold to a value from 1 through 20000. The default is 2000 (more than two flaps).
max-suppress-time
Maximum number of minutes a route can be suppressed by the device, regardless of how unstable the
route is. You can set maximum suppress time to a value from 1 through 255 minutes. The default is 40
minutes.
Route flap dampening
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