Enabling The Reachability Test Of The Virtual Ip Address; Disabling A Switch From Checking Number Of Hops In Vrrp Packets - Huawei Quidway S3700 Series Configuration Manual

Quidway S3700 Series Ethernet Switches
Configuration Guide - Reliability

7.7.4 Enabling the Reachability Test of the Virtual IP Address

By enabling the reachability test of a virtual IP address, you can use the ping function to detect
network reachability.
Context
In the S3700, you can ping the virtual IP address to check the following items:
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Do as follows on the switch that needs to be enabled with a reachable virtual IP address:
The following operations are valid for both VRRP for IPv4 and VRRP for IPv6.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
vrrp virtual-ip ping enable
Testing reachability of a virtual address is enabled.
By default, the ping function is enabled. The master switch responds to ping packets to the virtual
IP address of this backup group.
Pinging a virtual address may cause ICMP attacks. To prevent this, you can run the undo vrrp
virtual-ip ping enable command to disable the function of testing reachability of a virtual IP
address.
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7.7.5 Disabling a Switch from Checking Number of Hops in VRRP
Packets
By prohibiting the check of TTLs in VRRP packets, you can improve compatibility between
devices of different vendors.
Context
Defined in RFC 3768, the system detects number of hops in received VRRP packets. The packets
whose number of hops is not 255 are discarded.
In certain networking environments where Huawei devices and non-Huawei devices work
together, checking the number of hops in VRRP packets may result in discarding VRRP packets
incorrectly. You can disable the system from checking the number of hops in VRRP packets.
Do as follows on the switch that is prohibited from checking the number of hops of VRRP
packets:
Perform the following step as required to configure VRRP for IPv4 or VRRP6.
Issue 01 (2011-10-26)
Whether the master switch in the backup group is available.
Whether the internal user can access external networks through the virtual IP address that
serves as the default gateway.
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