Dell BigIron RX Series, Configuration Manual

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BigIron RX Series Configuration Guide 773
53-1002253-01
Configuring BGP4 neighbors
26
NOTE
The address filter must already be configured. Refer to “Filtering specific IP addresses” on
page 751.
ebgp-multihop [ <num> ] specifies that the neighbor is more than one hop away and that the
session type with the neighbor is thus EBGP-multihop. This option is disabled by default. The
<num> parameter specifies the TTL you are adding for the neighbor. You can specify a number
from 0 – 255. The default is 0. If you leave the EBGP TTL value set to 0, the software uses the IP
TTL value.
filter-list in | out <num,num,...> specifies an AS-path filter list or a list of AS-path ACLs. The in | out
keyword specifies whether the list is applied on updates received from the neighbor or sent to the
neighbor. If you specify in or out, the
<num,num,...> parameter specifies the list of AS-path filters.
The router applies the filters in the order in which you list them and stops applying the filters in the
AS-path filter list when a match is found. The weight
<num> parameter specifies a weight that the
device applies to routes received from the neighbor that match the AS-path filter or ACL. You can
specify a number from 0 – 65535.
Alternatively, you can specify filter-list <acl-num> in | out | weight to use an AS-path ACL instead of
an AS-path filter list. In this case, <acl-num> is an AS-path ACL.
NOTE
By default, if an AS-path does not match any of the filters or ACLs, the device denies the route. To
change the default behavior, configure the last filter or ACL as “permit any any”.
NOTE
The AS-path filter or ACL must already be configured. Refer to “Filtering AS-paths” on page 795.
maximum-prefix <num> specifies the maximum number of IP network prefixes (routes) that can be
learned from the specified neighbor or peer group. You can specify a value from 0 – 4294967295.
The default is 0 (unlimited).
•
The <num> parameter specifies the maximum number. You can specify a value from 0 –
4294967295. The default is 0 (unlimited).
•
The <threshold> parameter specifies the percentage of the value you specified for the
maximum-prefix <num> , at which you want the software to generate a Syslog message. You
can specify a value from 1 (one percent) to 100 (100 percent). The default is 100.
•
The teardown parameter tears down the neighbor session if the maximum-prefix limit is
exceeded. The session remains shutdown until you clear the prefixes using the clear ip bgp
neighbor all or clear ip bgp neighbor
<ip-addr> command, or change the neighbor’s
maximum-prefix configuration. The software also generates a Syslog message.
next-hop-self specifies that the router should list itself as the next hop in updates sent to the
specified neighbor. This option is disabled by default.
password [0 | 1] <string> specifies an MD5 password for securing sessions between the device
and the neighbor. You can enter a string up to 80 characters long. The string can contain any
alphanumeric characters, but the first character cannot be a number. If the password contains a
number, do not enter a space following the number.
The 0 | 1 parameter is the encryption option, which you can omit (the default) or which can be one
of the following: