Alteon Application Switch Operating System Application Guide
High Availability
508
Document
ID:
RDWR-ALOS-V2900_AG1302
Standard VRRP Components
Table 46 - Standard VRRP Components, page 508
describes the standard VRRP components.
Table 46: Standard VRRP Components
Component
Description
VRRP router
A physical router running VRRP.
Virtual router
Two or more VRRP routers can be configured to form a virtual router (as
defined in RFC 2338). Each VRRP router may participate in one or more
virtual routers. Each virtual router consists of a user-configured virtual
router identifier (VRID) and an IP address.
Virtual router MAC
address
The VRID is used to build the virtual router MAC address.
•
For legacy-based MAC addresses, the five highest-order octets of the
virtual router MAC address are the standard MAC prefix (00-00-5E-
00-01) defined in RFC 2338. The VRID is used to form the lowest-
order octet.
•
If HAID is non-zero, the MAC address is 00:03:B2:78:XX:XX.
•
If HAID=0 for IPv4, the MAC address is 00:00:5E:00:01:XX.
•
If HAID=0 for IPv6, the MAC address is 00:00:5E:00:02:XX.
Virtual interface IP
address owner
A VRRP router in a virtual router whose virtual interface router's IP
address matches the real interface address. This router responds to
packets addressed to the virtual interface router's IP address for ICMP
pings, TCP connections, and so on.
Only one of the VRRP routers in a virtual interface router may be
configured as the IP address owner. There is no requirement for any VRRP
router to be the IP address owner. Most VRRP installations choose not to
implement an IP address owner.
If the owner is not available, the backup becomes the master and takes
responsibility for packet forwarding and responding to Address Resolution
Protocol (ARP) requests. However, because this Alteon is not the owner, it
does not have a real interface configured with the virtual interface router's
IP address.
Virtual interface IP
address renter
A VRRP router in a virtual router that is not the IP address owner.
Virtual router master
Within each virtual router, one VRRP router is selected to be the virtual
router master. If the IP address owner is available, it always becomes the
virtual router master. For an explanation of the selection process, see
VRRP Priority Decides Which Alteon is the Master, page 509
The master forwards packets sent to the virtual interface router. It also
responds to Address Resolution Protocol (ARP) requests sent to the virtual
interface router's IP address. The master also sends out periodic
advertisements to let other VRRP routers know it is alive, and its priority.
Virtual router backup
A VRRP router within a virtual router not selected to be the master. If the
virtual router master fails, one of the virtual router backups becomes the
master and assumes its responsibilities.
