Configuring A Switch To Track An Interface; Displaying And Debugging Vrrp - 3Com Switch 7700 Configuration Manual

318 C 10: R
HAPTER ELIABILITY
Configuring a Switch to
Track an Interface
Displaying and
Debugging VRRP
Example: VRRP Single
Virtual Router
Table 7 Configure VRRP Timer
Operation
Clear VRRP timer
By default, adver-interval is 1.
The VRRP track interface function expands the backup function by including other
switch interfaces of participating routers. Backup is provided not only to the
interface where the virtual router resides, but also to other switch interfaces of
participating routers. By implementing the following command you can track
interfaces. If the interface that is being tracked fails, the priority of the switch,
including the interface, decreases automatically by the value specified by
value-reduced. The reduced priority of the switch results in comparatively higher
priorities of other switches within the virtual router, one of which becomes the
master switch.
Perform the following configuration in VLAN interface view.
Table 8 Configure Switch to Track a Specified Interface
Operation
Configure to track a specified interface
Stop tracking the specified interface
By default, value-reduced is set at 10.
When the switch is an IP address owner, its interfaces cannot be tracked.
After you configure a virtual router, execute the display command in all views to
display the VRRP configuration, and to verify the effect of the VRRP configuration.
Table 9 Display and Debug VRRP
Operation
Display VRRP state information.
Enable VRRP debugging.
Disable VRRP debugging.
You can enable VRRP debugging to display how it runs. You can set the argument
option to packet or state to debug the VRRP packet or VRRP state.
By default, the switch disables debugging.
Host A uses the VRRP virtual router which combines switch A and switch B as its
default gateway to visit host B on the Internet.
VRRP virtual router information includes virtual router ID1, virtual IP address
202.38.160.111, switch A as the Master and switch B as the backup allowed
preemption.
Command
undo vrrp vrid virtual-router-ID timer
advertise
Command
vrrp vrid virtual-router-ID track
vlan-interface interface-num [ reduced
value-reduced ]
undo vrrp vrid virtual-router-ID track [
vlan-interface interface-num ]
Command
display vrrp [ interface vlan-interface
interface-num ] [ virtual-router-ID ]
debugging vrrp { state | packet }
undo debugging vrrp { state | packet }