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DES-7200 Configuration Guide Chapter 1 Protocol-Independent
Configuration
1-11
Command Function
DES-7200(config-router)# distribute-list
{[access-list-number | access-list-name] |
prefix prefix-list-name [gateway
prefix-list-name] | gateway
prefix-list-name} in [interface-type
interface-number]
According to ACL rules, permit or deny
receiving distributed routes.
Prefix: This keyword specifies the prefix list
for filtering routes. The prefix list should be
separately configured by using the ip
prefix-list command.
Gateway: Use the prefix list to filter the
routes distributed according to the source
of the routes.
DES-7200(config-router)# no
distribute-list
{[access-list-number | name] | prefix
prefix-list-name [gateway
prefix-list-name] | gateway
prefix-list-name } in [interface-type
interface-number]
Remove the configuration.
1.4 IP Event Dampening Configuration
1.4.1 Overview
For a layer-3 switch, when a layer-3 network interface changes state frequently
(UP/DOWN), it will cause repeated flapping of routing table on the device. If
routing protocols have been configured, the routing protocols may also spread
such flap throughout the network, making their neighbors to update and
recalculate routes repeatedly. It will not only waste network bandwidth, but also
result in the instability of entire network. From the perspective of the device,
repeated route update and calculation will consume substantial CPU resources
and compromise the normal operation of client's network.
The IP Event Dampening feature introduces a mechanism to suppress interface
flapping and avoid bandwidth wasting and network instability. By configuring
suppression feature on the layer-3 interface, the interface can automatically
identify and suppress abnormal UP/DOWN flapping of the interface. From the
perspective of routing protocols, since such abnormal interface is placed in
DOWN state, a single-node link failure will not be spread by the routing protocols.
When the interface stops flapping and stabilizes, the interface will be
unsuppressed. IP Event Dampening well reduces network convergence times
and system CPU consumption and improves the stability of entire network.