HP ProCurve 1600M Handmatig supplement - Pagina 9

Suppression of RIP Advertisements for Backed Up Interfaces

The HP implementation also enhances VRRP by allowing you to configure the protocol to suppress RIP

advertisements for the backed up paths from Backup routers. Normally, a VRRP Backup router includes route

information for the interface it is backing up in RIP advertisements. As a result, other routers receive multiple

paths for the interface and might sometimes unsuccessfully use the path to the Backup rather than the path to the

Master. If you enable the HP implementation of VRRP to suppress the VRRP Backup routers from advertising the

backed up interface in RIP, other routers learn only the path to the Master router for the backed up interface.

The HP implementation of VRRP can use simple passwords to authenticate VRRP packets. The VRRP

authentication type is not a parameter specific to the VRID. Instead, VRRP uses the authentication type

associated with the interfaces on which you define the VRID. For example, if you configure your router interfaces

to use a simple password to authenticate traffic, VRRP uses the same simple password and VRRP packets that

do not contain the password are dropped. If your interfaces do not use authentication, neither does VRRP.

NOTE: The MD5 authentication type is not supported by HP 9300M routing switches.

VRRP operation is independent of the RIP, OSPF, and BGP4 protocols. Their operation is unaffected when VRRP

is enabled on a RIP, OSPF, or BGP4 interface.

All VRRP global and interface parameters take effect immediately. You do not need to reset the system to place

VRRP configuration parameters into effect.

The Standby Router Protocol (SRP) is a proprietary router redundancy protocol that supplies many of the same

features as HP's implementation of VRRP. HP's implementation of VRRP enhances the protocol by including

support for track ports, which also is a feature of SRP. (Track ports are described in "Track Ports and Track

Priority" on page 8.)

If you are configuring HP routing switches for redundancy, you can use either protocol. The features provided by

the two protocols are similar yet the protocols do differ in the following ways:

•

VRRP uses an IP multicast address for VRRP management traffic, while SRP uses pre-defined unicast

addresses.

•

VRRP uses real IP addresses or virtual interfaces assigned to an interface, but does not use virtual IP

addresses, whereas SRP must use one pre-defined virtual IP address for each virtual router. You can

associate a VRRP virtual router with an IP address or with a virtual interface (a named set of physical

interfaces).

•

Each VRRP virtual router (denoted by a unique VRID) can have one Master router and one or more Backup

routers. In contrast, each SRP router can have one Primary Router and only one Standby Router.

•

HP's implementation of VRRP supports authentication using simple clear text passwords. SRP does not

support authentication.

NOTE: If your HP routing switches already are using SRP and you do not need redundancy with devices that

cannot use SRP, you do not need to reconfigure to use VRRP.

HP recommends that you do not use VRRP and SRP on the same device.

Configuring VRRP