vrrp un-check ttl

Function

The vrrp un-check ttl command disables the check of TTL values in VRRP Advertisement packets.

The undo vrrp un-check ttl command enables the check of TTL values in VRRP Advertisement packets.

By default, TTL values in VRRP Advertisement packets are checked.

Format

vrrp un-check ttl

undo vrrp un-check ttl

Parameters

None

Views

100ge sub-interface view, 100GE interface view, 10GE sub-interface view, 10GE interface view, 200GE sub-interface view, 25GE sub-interface view, 25GE interface view, 400GE sub-interface view, 400GE interface view, 40GE sub-interface view, 40GE interface view, 50GE sub-interface view, 50GE interface view, Eth-Trunk sub-interface view, Eth-Trunk interface view, FlexE interface view, GE optical interface view, GE sub-interface view, GE interface view, GE electrical interface view, Global VE sub-interface view, VBDIF interface view, VE sub-interface view, VLANIF interface view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
vrrp	write

Usage Guidelines

Usage Scenario

As defined in relevant standards , the system checks TTL values in received VRRP Advertisement packets and drops the VRRP Advertisement packets if the TTL values are not 255.

When a Huawei device interworks with a non-Huawei device, checking TTL values in VRRP Advertisement packets may cause the packets to be incorrectly dropped, because the TTL values in the VRRP Advertisement packets sent by non-Huawei devices may not be 255. To prevent this issue, run the vrrp un-check ttl command to disable the system from checking the TTL values in the VRRP Advertisement packets.

Configuration Impact

After the vrrp un-check ttl command is run, the TTL values of all VRRP Advertisement packets received by a specified interface are not checked.

Precautions

The configuration may cause attacks from invalid packets. Therefore, exercise caution when running the vrrp un-check ttl command.

Example

# Disable the check of TTL values in VRRP Advertisement packets.

<HUAWEI> system-view
[~HUAWEI] interface GigabitEthernet 0/1/0
[~HUAWEI-GigabitEthernet0/1/0] vrrp vrid 1 virtual-ip 10.10.10.10
[*HUAWEI-GigabitEthernet0/1/0] vrrp un-check ttl