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Configuring BGP
Command
Step 18
neighbor {ip-address | peer-group-name} timers
keepalive holdtime
Step 19
neighbor {ip-address | peer-group-name} weight
weight
Step 20
neighbor {ip-address | peer-group-name}
distribute-list {access-list-number | name} {in |
out}
Step 21
neighbor {ip-address | peer-group-name}
filter-list access-list-number {in | out | weight
weight}
Step 22
neighbor {ip-address | peer-group-name}
version value
Step 23
neighbor {ip-address | peer-group-name}
soft-reconfiguration inbound
Step 24
end
Step 25
show ip bgp neighbors
Step 26
copy running-config startup-config
To disable an existing BGP neighbor or neighbor peer group, use the neighbor shutdown router
configuration command. To enable a previously existing neighbor or neighbor peer group that had been
disabled, use the no neighbor shutdown router configuration command.
Configuring Aggregate Addresses
Classless interdomain routing (CIDR) enables you to create aggregate routes (or supernets) to minimize
the size of routing tables. You can configure aggregate routes in BGP either by redistributing an
aggregate route into BGP or by creating an aggregate entry in the BGP routing table. An aggregate
address is added to the BGP table when there is at least one more specific entry in the BGP table.
Beginning in privileged EXEC mode, use these commands to create an aggregate address in the routing
table:
Command
Step 1
configure terminal
Step 2
router bgp autonomous-system
Step 3
aggregate-address address mask
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
32-54
Purpose
(Optional) Set timers for the neighbor or peer group.
•
The keepalive interval is the time within which keepalive
messages are sent to peers. The range is 1 to 4294967295
seconds; the default is 60.
•
The holdtime is the interval after which a peer is declared
inactive after not receiving a keepalive message from it. The
range is 1 to 4294967295 seconds; the default is 180.
(Optional) Specify a weight for all routes from a neighbor.
(Optional) Filter BGP routing updates to or from neighbors, as
specified in an access list.
(Optional) Establish a BGP filter.
(Optional) Specify the BGP version to use when communicating
with a neighbor.
(Optional) Configure the software to start storing received
updates.
Return to privileged EXEC mode.
Verify the configuration.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Enter BGP router configuration mode.
Create an aggregate entry in the BGP routing table. The aggregate
route is advertised as coming from the AS, and the atomic aggregate
attribute is set to indicate that information might be missing.
Chapter 32
Configuring IP Unicast Routing
78-17058-01
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