Dell PowerConnect B-FCXs, Configuration Manual

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1024 PowerConnect B-Series FCX Configuration Guide
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Optional configuration tasks
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Commands for router C
PowerConnectC(config)#router bgp
PowerConnectC(config-bgp-router)#local-as 64513
PowerConnectC(config-bgp-router)#confederation identifier 10
PowerConnectC(config-bgp-router)#confederation peers 64512 64513
PowerConnectC(config-bgp-router)#write memory
Commands for router D
PowerConnectD(config)#router bgp
PowerConnectD(config-bgp-router)#local-as 64513
PowerConnectD(config-bgp-router)#confederation identifier 10
PowerConnectD(config-bgp-router)#confederation peers 64512 64513
PowerConnectD(config-bgp-router)#write memory
Aggregating routes advertised to BGP4 neighbors
By default, the Layer 3 Switch advertises individual routes for all the networks. The aggregation
feature allows you to configure the Layer 3 Switch to aggregate routes in a range of networks into a
single CIDR number. For example, without aggregation, the Layer 3 Switch will individually advertise
routes for networks 207.95.1.0, 207.95.2.0, and 207.95.3.0. You can configure the Layer 3 Switch
to instead send a single, aggregate route for the networks. The aggregate route would be
advertised as 207.95.0.0.
NOTE
To summarize CIDR networks, you must use the aggregation feature. The auto summary feature
does not summarize networks that use CIDR numbers instead of class A, B, or C numbers.
To aggregate routes for 209.157.22.0, 209.157.23.0, and 209.157.24.0, enter the following
command.
PowerConnect(config-bgp-router)#aggregate-address 209.157.0.0 255.255.0.0
Syntax: aggregate-address <ip-addr> <ip-mask> [as-set] [nlri multicast | unicast | multicast
unicast]
[summary-only] [suppress-map
<map-name> ] [advertise-map <map-name> ]
[attribute-map <map-name> ]
The <ip-addr> and <ip-mask> parameters specify the aggregate value for the networks. Specify 0
for the host portion and for the network portion that differs among the networks in the aggregate.
For example, to aggregate 10.0.1.0, 10.0.2.0, and 10.0.3.0, enter the IP address 10.0.0.0 and the
network mask 255.255.0.0.
The as-set parameter causes the router to aggregate AS-path information for all the routes in the
aggregate address into a single AS-path.
The nlri multicast | unicast | multicast unicast parameter specifies whether the neighbor is a
multicast neighbor or a unicast neighbor. Optionally, you also can specify unicast if you want the
Layer 3 Switch to exchange unicast (BGP4) routes as well as multicast routes with the neighbor.
The default is unicast only.
The summary-only parameter prevents the router from advertising more specific routes contained
within the aggregate route.
The suppress-map <map-name> parameter prevents the more specific routes contained in the
specified route map from being advertised.