Dell PowerConnect B-FCXs, Configuration Manual

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PowerConnect B-Series FCX Configuration Guide 1033
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Filtering
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To disable re-advertisement of BGP4 routes to BGP4 neighbors except for routes that the software
also installs in the route table, enter the following command.
PowerConnect(config-bgp-router)#no readvertise
Syntax: [no] readvertise
To re-enable re-advertisement, enter the following command.
PowerConnect(config-bgp-router)#readvertise
Redistributing IBGP routes into RIP and OSPF
By default, the Layer 3 Switch does not redistribute IBGP routes from BGP4 into RIP or OSPF. This
behavior helps eliminate routing loops. However, if your network can benefit from redistributing the
IBGP routes from BGP4 into OSPF or RIP, you can enable the Layer 3 Switch to redistribute the
routes. To do so, use the following CLI method.
To enable the Layer 3 Switch to redistribute BGP4 routes into OSPF and RIP, enter the following
command.
PowerConnect(config-bgp-router)#bgp-redistribute-internal
Syntax: [no] bgp-redistribute-internal
To disable redistribution of IBGP routes into RIP and OSPF, enter the following command.
PowerConnect(config-bgp-router)#no bgp-redistribute-internal
Filtering
This section describes the following:
•
“Filtering specific IP addresses” on page 1033
•
“Filtering AS-paths” on page 1035
•
“Filtering communities” on page 1038
•
“Defining IP prefix lists” on page 1041
•
“Defining neighbor distribute lists” on page 1042
•
“Defining route maps” on page 1042
•
“Using a table map to set the rag value” on page 1050
•
“Configuring cooperative BGP4 route filtering” on page 1051
Filtering specific IP addresses
You can configure the router to explicitly permit or deny specific IP addresses received in updates
from BGP4 neighbors by defining IP address filters. The router permits all IP addresses by default.
You can define up to 100 IP address filters for BGP4.
•
If you want permit to remain the default behavior, define individual filters to deny specific IP
addresses.
•
If you want to change the default behavior to deny , define individual filters to permit specific IP
addresses.