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The route target (RT) attribute is used to identify sites that may receive
◆
routes tagged with a specific route target. Using this attribute allows
that route to be placed in per-site forwarding tables used for routing
traffic received from the corresponding sites.
The site of origin (SOO) attribute is used to identify the site from which
◆
the provider edge (PE) router learned the route. All routes learned from
a particular site are assigned the same site of origin attribute, no
matter if a site is connected to a single PE router or multiple PE routers.
Filtering based on this extended community attribute can prevent
routing loops from occurring when a site is multi-homed.
E
XAMPLE
Console(config)#route-map RD permit 13
Console(config-route-map)#match peer 192.168.0.99
Console(config-route-map)#set extcommunity 100:0 192.168.1.1:1
Console(config-route-map)#
This command sets the next-hop for a routing message. Use the no form
set ip next-hop
to remove this entry from a route map.
S
YNTAX
set ip next-hop {ip-address | peer-address}
no set ip next-hop [ip-address]
C
OMMAND
Route Map
C
OMMAND
The IP address specified as the next hop need not be an adjacent
◆
router.
When this command is used with the peer-address keyword in an
◆
inbound route map received from a BGP peer, the next hop of the
received matching routes are set to be the neighbor peer address,
overriding any other next hops.
When this command is used with the peer-address keyword in an
◆
outbound route map for a BGP peer, the next hop of the advertised
matching routes will be set to be the peering address of the local router,
thus disabling next hop calculation. This command therefore has finer
granularity than the
set the next hop for some routes, but not others. While the
next-hop-self
specified neighbor(s).
ip-address – An IPv4 address of the next hop, expressed in dotted
decimal notation.
peer-address – Sets the next hop as the BGP peering address.
M
ODE
U
SAGE
neighbor next-hop-self
command sets the next hop for all routes sent to the
– 1913 –
| IP Routing Commands
C
51
HAPTER
Policy-based Routing for BGP
command, because it can
neighbor
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