Foundry Configuration Guide for the FESX, FSX, and FWSX
21 - 24
© Foundry Networks, Inc.
December 2005
To enable load sharing of paths from different neighboring ASs, enter the following command at the BGP
configuration level of the CLI:
FESX424 Router(config-bgp-router)# multipath multi-as
Syntax:
[no] multipath ebgp | ibgp | multi-as
The
ebgp | ibgp | multi-as
parameter specifies the change you are making to load sharing:
•
ebgp
– Load sharing applies only to EBGP paths. Load sharing is disabled for IBGP paths.
•
ibgp
– Load sharing applies only to IBGP paths. Load sharing is disabled for EBGP paths.
•
multi-as
– Load sharing is enabled for paths from different ASs.
By default, load sharing applies to EBGP and IBGP paths, and does not apply to paths from different neighboring
ASs.
Specifying a List of Networks to Advertise
By default, the router sends BGP4 routes only for the networks you identify using the
network
command or that
are redistributed into BGP4 from RIP or OSPF. You can specify up to 600 networks.
To specify a network to be advertised, use either of the following methods.
NOTE:
The exact route must exist in the IP route table before the Layer 3 Switch can create a local BGP route.
To configure the Layer 3 Switch to advertise network 209.157.22.0/24, enter the following command:
FESX424 Router(config-bgp-router)# network 209.157.22.0 255.255.255.0
Syntax:
network <ip-addr> <ip-mask> [nlri multicast | unicast | multicast unicast]
[route-map <map-name>] | [weight <num>] | [backdoor]
The <ip-addr> is the network number and the <ip-mask> specifies the network mask.
The
nlri multicast | unicast | multicast unicast
parameter specifies whether the neighbor is a multicast neighbor
or a unicast neighbor. For MBGP, you must specify
multicast
. 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
route-map
<map-name> parameter specifies the name of the route map you want to use to set or change
BGP4 attributes for the network you are advertising. The route map must already be configured.
The
weight
<num> parameter specifies a weight to be added to routes to this network.
The
backdoor
parameter changes the administrative distance of the route to this network from the EBGP
administrative distance (20 by default) to the Local BGP weight (200 by default), thus tagging the route as a
backdoor route. Use this parameter when you want the router to prefer IGP routes such as RIP or OSPF routes
over the EBGP route for the network.
Specifying a Route Map Name when Configuring BGP4 Network Information
You can specify a route map as one of the parameters when you configure a BGP4 network to be advertised. The
Layer 3 Switch can use the route map to set or change BGP4 attributes when creating a local BGP4 route.
To configure network information and use a route map to set or change BGP4 attributes, use the following CLI
method.
NOTE:
You must configure the route map before you can specify the route map name in a BGP4 network
configuration.
Содержание FastIron Edge Switch X424
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