Alcatel-Lucent 7750 SR-OS, Configuration Manual

Page: 361 / 674

VRRP
7750 SR OS Router Configuration Guide Page 361
The priority is the most important parameter set on a non-owner virtual router instance. The priority
defines a virtual router’s selection order in the master election process. Together, the priority value
and the
preempt mode allow the virtual router with the best priority to become the master virtual
router.
The base-priority is used to derive the in-use priority of the virtual router instance as modified by any
optional VRRP priority control policy. VRRP priority control policies can be used to either override
or adjust the base priority value depending on events or conditions within the chassis.
The priority command is only available in the non-owner vrrp nodal context. The priority of owner
virtual router instances is permanently set to 255 and cannot be changed.
For non-owner virtual router instances, the default base priority value is 100.
The no form of the command reverts to the default value.
Default
100
Parameters
base-priority — The base priority used by the virtual router instance expressed as a decimal integer. If
no VRRP priority control policy is defined, the base-priority is the in-use priority for the virtual
router instance.
Values
1 — 254
ping-reply
Syntax [ no ] ping-reply
Context config>router>if>vrrp
config>router>if>ipv6>vrrp
Description
This command enables the non-owner master to reply to ICMP echo requests directed at the vritual
router instances IP addresses.
Non-owner virtual router instances are limited by the VRRP specifications to responding to ARP
requests destined to the virtual router IP addresses and routing IP packets not addressed to the virtual
router IP addresses. Many network administrators find this limitation frustrating when
troubleshooting VRRP connectivity issues.
7750 SR OS allows this access limitation to be selectively lifted for certain applications. Ping, Telnet
and SSH can be individually enabled or disabled on a per-virtual-router-instance basis.
The ping-reply command enables the non-owner master to reply to ICMP echo requests directed at
the virtual router instances IP addresses. The Ping request can be received on any routed interface.
Ping must not have been disabled at the management security level (either on the parental IP interface
or based on the Ping source host address).
When ping-reply is not enabled, ICMP echo requests to non-owner master virtual IP addresses are
silently discarded.
Non-owner backup virtual routers never respond to ICMP echo requests regardless of the ping-reply
setting.
The ping-reply command is only available in non-owner vrrp nodal context.
By default, ICMP echo requests to the virtual router instance IP addresses are silently discarded.