White Papers

holdtime Enter a number for the time interval, in seconds, between the last keepalive
message and declaring the router dead. The range is 3 to 65535. The default is
180 seconds.
Defaults
● keepalive = 60 seconds
● holdtime = 180 seconds
Command Modes ROUTER BGP
Command
History
Version 8.2.1.0 Introduced on the E-Series ExaScale.
Version 7.4.1.0 Introduced
Usage
Information
Timer values configured with the neighbor timers command override the timer values configured
with the timers bgp command.
When two neighbors, configured with different keepalive and holdtime values, negotiate for new
values, the resulting values are as follows:
● the lower of the holdtime values is the new holdtime value, and
● whichever is the lower value; one-third of the new holdtime value, or the configured keepalive
value is the new keepalive value.
neighbor update-source
Enable the E-Series software to use Loopback interfaces for TCP connections for BGP sessions.
C-Series, E-Series
Syntax
neighbor {ipv6-address | peer-group-name} update-source loopback interface
To use the closest interface, use the no neighbor {ipv6-address | peer-group-name}
update-source loopback interface command.
Parameters
ipv6-address Enter the IPv6 address in the x:x:x:x::x format.
NOTE: The :: notation specifies successive hexadecimal fields of zeros.
peer-group-name Enter the name of the peer group to disable all routers within the peer group.
loopback
interface
Enter the keyword loopback followed by a number of the loopback interface. The
range is 0 to 16383.
Defaults Not configured.
Command Modes ROUTER BGP
Command
History
Version 8.2.1.0 Introduced on the E-Series ExaScale.
Version 7.4.1.0 Introduced
Usage
Information
Loopback interfaces are up constantly and the BGP session may need one interface constantly up
to stabilize the session. The neighbor update-source command is not necessary for directly
connected internal BGP sessions.
458 Border Gateway Protocol