5000 Series Layer 2/3 Managed Data Center Switch CLI Reference Guide
1087
Command Mode
•
BGP Router Config
•
Peer Template Config
11-93 neighbor update-source (IPv4 VRF Address Family Config)
Use this command to configure BGP to use a specific IP address as the source address for the TCP
connection with a neighbor. This IP address must be the IP address configured on the peer as its
neighbor address for this router.
The IP address used as the source address in IP packets sent to a neighbor must be the same address
used to configure the local system as a neighbor of the neighbor router. In other words, if the update
source is configured, it must be the same IP address used in the neighbor remote-as command on the
peer.
It is common to use an IP address on a loopback interface because a loopback interface is always
reachable, as long as any routing interface is up. The peering session can stay up as long as the
loopback interface remains reachable. lf you use an IP address on a routing interface, then the peering
session will go down if that routing interface goes down.
The
update-source
option is not allowed for eBGP peers as this requires multi-hop eBGP to be working.
Multi- hop eBGP is not supported.
Issue this command in Peer Template Configuration Mode to add it to a peer template.
Use the
no
command to configure BGP to use the primary IPv4 address on the outgoing interface to the
neighbor for the TCP connection.
neighbor {ipv4-address | autodetect interface interface-name} update-source interface
no neighbor {ipv4-address | autodetect interface interface-name} update-source
Parameters
ipv4-address
The neighbor’s IPv4 address. This is the IP address on the link that
connects the two peers.
interface interface-name
(Optional) Indicates the primary interface name on this interface for the
TCP connection with the neighbor.
If the neighbor’s IPv6 address is a
link local address, the local interface must also be specified.
autodetect interface
interface-name
The neighbor’s IPv6 link local address that will be auto detected on the
specified interface.
interface
The primary IPv4 address on this interface is used as the source IP
address for the TCP connection with the neighbor.
Default
The default is TCP Connections defined, if update source is not configured, by primary IPv4 address on
outgoing interface to the neighbor.
Command Mode
IPv4 VRF Address Family Config