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[SwitchB] display ipv6 multicast rpf-info 1002::1
RPF information about source 1002::1:
RPF interface: Vlan-interface101, RPF neighbor: 1001::1
Referenced prefix/prefix length: 1002::/64
Referenced route type: mbgp
Route selection rule: preference-preferred
Load splitting rule: disable
Troubleshooting BGP
Symptom
The display bgp peer ipv4 unicast or display bgp peer ipv6 unicast command output shows that
the state of the connection to a peer cannot become established.
Analysis
To become BGP peers, any two routers must establish a TCP connection using port 179 and
exchange Open messages successfully.
Solution
1. To resolve the problem:
a. Use the display current-configuration command to verify the current configuration, and
verify that the peer's AS number is correct.
b. Use the display bgp peer ipv4 unicast or display bgp peer ipv6 unicast command to
verify that the peer's IP/IPv6 address is correct.
c. If a loopback interface is used, verify that the loopback interface is specified with the peer
connect-interface command.
d. If the peer is a non-direct EBGP peer, verify that the peer ebgp-max-hop command is
configured.
e. If the peer ttl-security hops command is configured, verify that the command is configured
on the peer. Verify that the hop-count values configured on them are greater than the
number of hops between them.
f. Verify that a valid route to the peer is available.
g. Use the ping command to verify the connectivity to the peer.
h. Use the display tcp verbose or display ipv6 tcp verbose command to verify the TCP
connection.
i. Verify that no ACL rule is applied to disable TCP port 179.
2. If the problem persists, contact Hewlett Packard Enterprise Support.
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