Brocade FastIron Ethernet Switch Layer 3 Routing Configura Uživatelský manuál stáhnout pdf (Strana 588)

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FIGURE 36 Switch 1 and Switch 2 configured as VRRP virtual routers for redundant network access

for Host1

The dashed box represents a VRRP virtual router. When you configure a virtual router, one of the

configuration parameters is the virtual router ID (VRID), which can be a number from 1 through 255. In

this example, the VRID is 1.

NOTE

You can provide more redundancy by also configuring a second VRID with Switch 2 as the Owner and

Switch 1 as the Backup. This type of configuration is sometimes called Multigroup VRRP.

Virtual router ID

A virtual router ID ( VRID) consists of one Master router and one or more Backup routers. The Master

router is the router that owns the IP addresses you associate with the VRID. For this reason, the

Master router is sometimes called the "Owner". Configure the VRID on the router that owns the default

gateway interface. The other router in the VRID does not own the IP addresses associated with the

VRID but provides the backup path if the Master router becomes unavailable.

Virtual router MAC address

Notice the MAC address associated with VRID1 in VRRP overview on page 586. The first five octets

of the address are the standard MAC prefix for VRRP packets, as described in RFC 2338. The last

octet is the VRID. The VRID number becomes the final octet in the virtual MAC address associated

with the virtual router.

When you configure a VRID, the software automatically assigns its MAC address. When a VRID

becomes active, the Master router broadcasts a gratuitous ARP request containing the virtual router

MAC address for each IP address associated with the virtual router. In VRRP overview on page 586,

Switch 1 sends a gratuitous ARP request with MAC address 00-00-5E-00-01-01 and IP address

Virtual router ID

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