Troubleshooting Bgp; Symptom; Analysis; Solution - HP FlexFabric 12900E Series Configuration Manual

IpPre: N/A
Tag: 0
OrigTblID: 0x0
TableID: 0xa
NibID: 0x25000003
AttrID: 0x4
Flags: 0x10060
Label: NULL
BkLabel: NULL
Tunnel ID: Invalid
BkTunnel ID: Invalid
FtnIndex: 0x0

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.
QosLocalID: N/A
State: Active Adv
OrigVrf: default-vrf
OrigAs: 100
LastAs: 100
Neighbor: 3002::1
OrigNextHop: 3002::1
RealNextHop: 3002::1
BkNextHop: 2002::1
Interface: Vlan-interface 101
BkInterface: Vlan-interface 201
357