8
Question
Command or method
Result
Remarks
and enable BPDU
guard. Alternatively,
disable the spanning
tree feature on the
ports.
•
Disable the spanning
tree feature on ports
connected to devices
that do not support
spanning tree
protocols.
•
Do not disable
TC-BPDU guard.
VRRP
Is the handshake interval
correctly set?
Are the handshake
intervals of the two ends
the same?
display vrrp
□
OK
□
Not OK
□
Not related
Change the handshake
interval to 3 seconds if the
number of VRRP groups is
less than five.
If five or more VRRP
groups exist, assign three
or five VRRP groups into
one group, and configure
the handshake interval as 3
seconds, 5 seconds, and 7
seconds for each group.
ARP
Are there ARP conflicts?
display logbuffer
□
OK
□
Not OK
□
Not related
If the log contains ARP
conflict records, verify that
the hosts in conflict are
legitimate, and remove the
conflicts.
OSPF
Is the router ID of the
device unique on the
network?
display ospf peer
□
OK
□
Not OK
□
Not related
Change the router ID if it is
not unique on the network.
To restart route learning
after you remove the router
ID
conflict, you must
execute the
reset ospf
process
command.
Are there a lot of errors in
the output from the
display
ospf statistics error
command?
display ospf
statistics error
□
OK
□
Not OK
□
Not related
If a large number of OSPF
errors has occurred and
the number continues to
increase, collect the error
information
for further
analysis.
Are there severe route
flappings?
display ip
routing-table
statistics
□
OK
□
Not OK
□
Not related
Examine the statistics for
added and deleted routes
during the system uptime.
If route flapping occurs,
locate the flapping route
and the source device to
