Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
132
Table 3-71: Failure analysis method for VRRP
No. Items to check and commands Action
1 On the Switch and remote devices that
make up a virtual router, check the
status of the virtual router, and check
whether only one device is the master
router and the others are backup routers.
For devices that make up a virtual router, if only one device is the master
router and the others are the backup routers, check the following:
• If terminals are connected directly to the virtual router not via other
routers, make sure the virtual IP address of the virtual router is set as
the default gateway in the network settings of the terminals.
• Check the routing information of the devices on the communication
path that includes the Switch.
If there is no problem with the terminal settings and with the routing
information of the devices on the communication path, go to No. 2.
If the status of the virtual router is not correct, go to No. 3.
2 Execute the
show vlan command with
the
detail parameter, and check
whether the status of the physical port is
Forwarding in the VLAN to which the
virtual router is connected.
• If the status of the physical port is
Blocking, communication might
have been temporarily blocked due to, for example, the topology
change for STP. Wait a while, and then make sure that the status of
the physical port is
Forwarding. If you wait a while but the status
of the physical port is not
Forwarding, check the configuration and
physical network configuration.
• If the status of the physical port is
down, the port is not physically
connected. Check whether connectors and cables are connected
correctly.
If the status of the physical port is
Forwarding, check whether the load
of the routing destination network is high.
3 For the virtual routers of the Switch and
remote devices that make up a virtual
router, check whether only one virtual
router is the master router.
• For AX6700S, AX6600S, or AX6300S series switches:
If multiple virtual routers are master routers, go to No. 4.
• For AX3800S or AX3600S series switches:
If multiple virtual routers are master routers, go to No. 6.
If only one virtual router is the master router, go to No. 10.
4 Execute the
show vrrpstatus
command with the detail parameter,
and check whether the primary virtual
router that is followed by other virtual
routers has been configured.
If the primary virtual router followed by other virtual routers has been
configured, go to No. 5.
If the primary virtual router followed by other virtual routers has not been
configured, go to No. 6.
5 Execute the
show vrrpstatus command
with the
detail parameter, and check
whether VLANs and VRIDs for the
followed primary virtual router are the
same among devices that make up the
virtual routers.
If VLANs and VRIDs for the primary virtual router are different among
devices that make up the virtual routers, multiple routers will be master
routers. Use the same settings among devices that make up the virtual
routers.
If VLANs and VRIDs for the primary virtual router are the same among
devices that make up the virtual routers, go to No. 6.
Note that items No. 6 onward must be applied to the primary virtual
router.
6 Check communication between routers
that make up the virtual router by using
the
ping ipv6 command with actual
IPv6 addresses.
If communication with actual IPv6 addresses is not possible between
routers that make up the virtual router, check the physical network
configuration.
If the result of the
ping ipv6 command indicates that communication
with actual IPv6 addresses is possible between routers that make up the
virtual router, go to No. 7.