Lenovo RackSwitch G8264 Command Reference Manual page 570

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G8264 Command Reference for ENOS 8.4
Table 303.
BGP Peering Group Configuration Options (continued)
Command Syntax and Usage
neighbor group <1‐8> time­to­live <number of router hops (1‐255)>
Time‐to‐live (TTL) is a value in an IP packet that tells a network router
whether or not the packet has been in the network too long and must be
discarded. TTL specifies a certain time span in seconds that, when exhausted,
would cause the packet to be discarded. The TTL is determined by the number
of router hops the packet is allowed before it must be discarded.
This command specifies the number of router hops that the IP packet can
make. This value is used to restrict the number of "hops" the advertisement
makes. It is also used to support multi‐hops, which allow BGP peering groups
to talk across a routed network.
The default number is set at 1.
Note: The TTL value is significant only to eBGP peering groups; for iBGP
peering groups the TTL value in the IP packets is always 255 (regardless of the
configured value).
Command mode: Router BGP
no neighbor group <1‐8> time­to­live <1‐255>
Disables the TTL feature.
Command mode: Router BGP
neighbor group <1‐8> timers hold­time <hold time (0, 3‐65535)>
Sets the period of time, in seconds, that will elapse before the peering group
session is torn down because the switch hasn't received a "keep alive" message
from the peer.
The default value is 180 seconds.
Command mode: Router BGP
neighbor group <1‐8> timers keep­alive <keepalive time (0‐21845)>
Sets the keep‐alive time for the specified peering group in seconds.
The default value is 60 seconds.
Command mode: Router BGP
neighbor group <1‐8> ttl­security hops <1‐254>
Sets the minimum number of time‐to‐live (TTL) router hops an IP packet must
have to not be discarded.
Command mode: Router BGP
no neighbor group <1‐8> ttl­security hops
Disables the TTL security feature.
Command mode: Router BGP
neighbor group <1‐8> update­source {<interface number (1‐126)>|
|loopback <interface number (1‐5)>}
Sets the local IP interface or loopback interface for this peering group.
Command mode: Router BGP