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ExtremeWare XOS 10.1 Concepts Guide
Virtual Router Redundancy Protocol
VRRP Terms
Table 33 describes terms associated with VRRP.
Determining the VRRP Master
The VRRP master is determined by the following factors:
• VRRP priority
—This is a user-defined field. The range of the priority value is 1 to 254; a higher
number has higher priority. The value of 255 is reserved for a router that is configured with the
virtual router IP address. A value of 0 is reserved for the master router, to indicate it is releasing
responsibility for the virtual router. The default value is 100.
• Higher IP address
—If the routers have the same configured priority, the router with the higher IP
address becomes the master.
VRRP Tracking
Tracking information is used to track various forms of connectivity from the VRRP router to the outside
world. ExtremeWare XOS supports the use of VRRP route table tracking.
You can configure VRRP to track specified routes in the route table as criteria for failover. If any of the
configured routes are not available within the route table, the router automatically relinquishes master
status and remains in backup mode.
To add or delete a tracked route, use the following command:
config vrrp vlan <vlan_name> vrid <vridval> [add | delete] track-iproute
<ipaddress>/<masklength>
Table 33: VRRP Terms
Term
Description
virtual router
A VRRP router is a group of one or more physical devices that acts as the default
gateway for hosts on the network. The virtual router is identified by a virtual router
identifier (VRID) and an IP address.
VRRP router
Any router that is running VRRP. A VRRP router can participate in one or more virtual
routers. A VRRP router can be a backup router for one more master routers.
IP address owner
A single VRRP router that has the IP address of the virtual router configured as its real
interface address. The IP address owner responds to TCP/IP packets addressed to the
virtual router IP address. The IP address owner is optional in a VRRP configuration.
master router
The physical device (router) in the virtual router that is responsible for forwarding
packets sent to the virtual router, and responding to ARP requests. The master router
sends out periodic advertisements that let backup routers on the network know that it is
alive. If the IP address owner is identified, it always becomes the master.
backup router
Any VRRP router in the virtual router that is not elected as the master. The backup
router is available to assume forwarding responsibility if the master becomes
unavailable.
VRID
Virtual router identifier. Each virtual router is given a unique VRID. All of the VRRP
routers that participate in the virtual router are assigned the same VRID.
virtual router MAC
address
RFC 2338 assigns a static MAC address for the first 5 octets of the virtual router.
These octets are set to 00-00-5E-00-01. When you configure the VRID, the last octet of
the MAC address is dynamically assigned the VRID number.
Summary of Contents for ExtremeWare XOS 10.1
Page 12: ...12 ExtremeWare XOS 10 1 Concepts Guide Contents...
Page 15: ...Part 1 Using ExtremeWare XOS...
Page 16: ......
Page 20: ...20 ExtremeWare XOS 10 1 Concepts Guide ExtremeWare XOS Overview...
Page 32: ...32 ExtremeWare XOS 10 1 Concepts Guide Accessing the Switch...
Page 74: ...74 ExtremeWare XOS 10 1 Concepts Guide Virtual LANs VLANs...
Page 80: ...80 ExtremeWare XOS 10 1 Concepts Guide Forwarding Database FDB...
Page 112: ...112 ExtremeWare XOS 10 1 Concepts Guide Status Monitoring and Statistics...
Page 133: ...Part 2 Using Switching and Routing Protocols...
Page 134: ......
Page 174: ...174 ExtremeWare XOS 10 1 Concepts Guide Virtual Router Redundancy Protocol...
Page 184: ...184 ExtremeWare XOS 10 1 Concepts Guide IP Unicast Routing...
Page 202: ...202 ExtremeWare XOS 10 1 Concepts Guide Interior Gateway Protocols...
Page 216: ...216 ExtremeWare XOS 10 1 Concepts Guide Exterior Gateway Routing Protocols...
Page 224: ...224 ExtremeWare XOS 10 1 Concepts Guide IP Multicast Routing...
Page 225: ...Part 3 Appendixes...
Page 226: ......
Page 234: ...234 ExtremeWare XOS 10 1 Concepts Guide Software Upgrade and Boot Options...
Page 242: ...242 ExtremeWare XOS 10 1 Concepts Guide Troubleshooting...
Page 256: ...4 ExtremeWare XOS 10 1 Concepts Guide Index of Commands...