Foundry Networks Switch and Router Installation And Configuration Manual page 867

e4
S
PC 4
Figure 22.4 NetIron2 becomes active router after links e1 and e3 fail with multiple track ports defined
Independent Operation of RIP and OSPF
FSRP operation is independent of the RIP and OSPF protocols. RIP and OSPF operation will be unaffected when
FSRP is enabled on its interfaces.
Dynamic FSRP Configuration
All FSRP global and interface parameters are dynamically activated. You do not need to reset the system to place
FSRP configuration parameters into effect.
Differences Between FSRP and VRRP
The Virtual Router Redundancy Protocol (VRRP) is a standards-based protocol that provides redundancy to
routers within a LAN. VRRP is described in RFC 2338. Foundry's implementation of VRRP provides many of the
same features as FSRP. In addition, VRRP enables you to configure third-party devices that adhere to RFC 2338
along with Foundry devices as virtual routers. FSRP requires that the other devices support FSRP.
If you are configuring Foundry routers 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 FSRP uses pre-defined unicast
addresses.
• VRRP uses real IP addresses assigned to an interface and does not use virtual IP addresses, whereas FSRP
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 Virtual Router ID [VRID]) can have one Master router and one
or more Backup routers. In contrast, each FSRP router can have one Primary Router and only one Standby
Router. Most VRRP and FSRP configurations consist of two routers—one active router (Master or Primary)
and one standby router (Backup or Standby).
• Foundry's implementation of VRRP supports authentication using simple clear text passwords. FSRP does
not support authentication.
December 2000
Link Link
Activi ty Act ivit y
Console
Power
S
PC 1
A
Link Link
Ac tivi ty Act ivit y
Console
Power
A=Active
S=Standby
Standby
NetIron1
e1 e2 e3
S
PC 2
A A
NetIron2
Active
Configuring FSRP
S
PC 3
A
22 - 5