3com MSR 20-20 참조 매뉴얼

Interface view

None

Use the vrrp un-check ttl command to disable TTL check on VRRP packets.

Use the undo vrrp un-check ttl command to enable TTL check on VRRP 
packets.

By default, TTL check on VRRP packets is enabled.

# Disable TTL check on VRRP packets.

<Sysname> system-view

[Sysname] interface ethernet 1/0

[Sysname-Ethernet1/0] vrrp un-check ttl 

vrrp vrid virtual-router-id preempt-mode [ timer delay delay-value ]

undo vrrp vrid virtual-router-id preempt-mode [ timer delay ]

Interface view

virtual-router-id: Virtual router ID or VRRP standby group number, in the range 1 
to 255.

timer delay delay-value: Sets preemption delay. The delay-value argument ranges 
from 0 to 255 and defaults to 0, in seconds.

Use the vrrp vrid preempt-mode command to enable preemption on the 
router and configure its preemption delay in the specified standby group.

Use the undo vrrp vrid preempt-mode command to disable preemption on 
the router in the specified standby group.

Use the undo vrrp vrid preempt-mode timer delay command to restore the 
default preemption delay, that is, zero seconds.

The default mode is immediate preemption without delay.

On an instable network, the standby group member in the backup state may not 
normally receive the packets from the master member due to network congestion,