Setting The Output Interface To The Null Interface; Trunk Formation - Dell PowerConnect B-RX Configuration Manual

Setting the output interface to the null interface

The following commands configure a PBR to send all traffic from 192.168.1.204/32 to the null
interface, thus dropping the traffic instead of forwarding it.
BigIron RX(config)# access-list 56 permit 209.168.1.204 0.0.0.0
The following commands configure an entry in a route map called "file-13". The first entry (permit
56) matches on the IP address information in ACL 56 above. For IP traffic from the host
209.168.1.204/32, this route map entry sends the traffic to the null interface instead of
forwarding it, thus sparing the rest of the network the unwanted traffic.
BigIron RX(config)# route-map file-13 permit 56
BigIron RX(config-routemap file-13)# match ip address 56
BigIron RX(config-routemap file-13)# set interface null0
BigIron RX(config-routemap file-13)# exit
The following command enables PBR by globally applying the route map to all interfaces.
BigIron RX(config)# ip policy route-map file-13
Alternatively, you can enable the PBR on specific interfaces, as shown in the following example.
The commands in this example configure IP addresses in the source subnet identified in ACL 56,
then apply route map file-13 to the interface.
BigIron RX(config)# interface ethernet 3/11
BigIron RX(config-if-e10000-3/11)# ip address 192.168.1.204/32
BigIron RX(config-if-e10000-3/11)# ip policy route-map file-13

Trunk formation

When a trunk is formed, the PBR policy on the primary port applies to all the secondary ports. If a
different PBR policy exists on a secondary port at a time of a trunk formation, that policy is
overridden by the PBR policy on the primary port. If the primary port does not have a PBR policy,
then the secondary ports will not have any PBR policy. When a trunk is removed, reload the device
to restore any PBR policies that were originally configured on the secondary ports.
BigIron RX Series Configuration Guide
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Trunk formation
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