Configuration manual

Terms and Definitions
23-8 Configuring VRRP
Router 2(su)->router(Config-router)#create vlan 111 3
Router 2(su)->router(Config-router)#address vlan 111 3 172.111.1.150 0
Router 2(su)->router(Config-router)#master-icmp-reply vlan 111 3
Router 2(su)->router(Config-router)#enable vlan 111 3
Router 2(su)->router(Config-router)#exit
Terms and Definitions
Table 23-2 lists terms and definitions used in this VRRP configuration discussion.
Table 23-2 VRRP Configuration Terms and Definitions
Term Definition
Backup The set of VRRP routers available to assume forwarding responsibility for a virtual
router should the current Master fail.
IP Address owner The VRRP router that has the virtual router's IP address(es) as real interface
address(es). This is the router that, when up, will respond to packets addressed to
one of these IP addresses for ICMP pings, TCP connections, etc.
Master The VRRP router that is assuming the responsibility of forwarding packets sent to the
IP address(es) associated with the virtual router, and answering ARP requests for
these IP addresses.
Priority The priority field specifies the sending VRRP router's priority for the virtual router.
Higher values equal higher priority. This field is an 8 bit unsigned integer field. The
priority value for the VRRP router that owns the IP address(es) associated with the
virtual router MUST be 255 (decimal).
VRRP routers backing up a virtual router MUST use priority values between 1-254
(decimal). The default priority value for VRRP routers backing up a virtual router is
100 (decimal). The priority value zero (0) has special meaning indicating that the
current Master has stopped participating in VRRP. This is used to trigger Backup
routers to quickly transition to Master without having to wait for the current Master to
timeout.
Virtual Router An abstract object managed by VRRP that acts as a default router for hosts on a
shared LAN. It consists of a Virtual Router Identifier and a set of associated IP
address(es) across a common LAN. A VRRP Router may backup one or more virtual
routers.
VRID Virtual Router ID — a unique number associated with each virtual router.
VRRP Router A router running the Virtual Router Redundancy Protocol. It may participate in one or
more virtual routers.
A VRRP router may associate a virtual router with its real addresses on an interface,
and may also be configured with additional virtual router mappings and priority for
virtual routers it is willing to backup.