Alcatel-Lucent 7210 SAS M Service Manual page 671

This configuration parameter can be set at three levels: global level (applies to all peers), group level
(applies to all peers in peer-group) or neighbor level (only applies to specified peer). The most
specific value is used.
The lower the preference the higher the chance of the route being the active route. The OS assigns
BGP routes highest default preference compared to routes that are direct, static or learned via MPLS
or OSPF.
The no form of the command used at the global level reverts to default value.
The no form of the command used at the group level reverts to the value defined at the global level.
The no form of the command used at the neighbor level reverts to the value defined at the group level.
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Default
preference — The route preference, expressed as a decimal integer.
Parameters
path-mtu-discovery
Syntax [no] path-mtu-discovery
Context config>router>bgp
config>router>bgp>group
config>router>bgp>group>neighbor
This command enables path MTU discovery for the associated TCP connections. In doing so, the
Description
MTU for the associated TCP session will be initially set to the egress interface MTU. The DF bit will
also be set so that if a router along the path of the TCP connection cannot handle a packet of a
particular size without fragmenting, it will send back and ICMP message to set the path MTU for the
given session to a lower value that can be forwarded without fragmenting.
The no form of the command disables path MTU discovery.
no path-mtu-discovery
Default
prefix-limit
Syntax prefix-limit limit [log-only] [threshold percent]
no prefix-limit
Context config>service>vprn>bgp>group
config>service>vprn>bgp>group>neighbor
This command configures the maximum number of routes BGP can learn from a peer.
Description
When the number of routes reaches a certain percentage (default is 90% of this limit), an SNMP trap
is sent. When the limit is exceeded, the BGP peering is dropped and disabled.
The no form of the command removes the prefix-limit.
no prefix-limit
Default
7210 SAS M Services Guide
1 — 255
Values
Virtual Private Routed Network Services
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