Route Processor (RP) controls the system, provides network services, runs
routing protocols and presents the system management interface.
virtual forwarder. One virtual forwarder within a GLBP group is elected as
active virtual forwarder for a specified virtual MAC address, and it is
responsible for forwarding packets sent to that MAC address. Multiple active
virtual forwarders can exist for each GLBP group.
gateway. One virtual gateway within a GLBP group is elected as the active
virtual gateway, and is responsible for the operation of the protocol.
gateway—Gateway Load Balancing Protocol gateway. A router or gateway
running GLBP. Each GLBP gateway may participate in one or more GLBP groups.
GLBP group—Gateway Load
Balancing Protocol group. One or more GLBP gateways configured with the same
GLBP group number on connected Ethernet interfaces.
Software Upgrade. A process that allows Cisco IOS XE software to be updated or
otherwise modified while packet forwarding continues. In most networks, planned
software upgrades are a significant cause of downtime. ISSU allows
be modified while packet forwarding continues, which increases network
availability and reduces downtime caused by planned software upgrades.
forwarding. The ability of a router to continue to forward traffic to a router
that may be recovering from a failure. Also, the ability of a router recovering
from a failure to continue to correctly forward traffic sent to it by a peer.
Processor. A generic term for the centralized control unit in a chassis.
Platforms usually use a platform-specific term, such as RSP on the Cisco 7500,
the PRE on the Cisco 10000, or the SUP+MSFC on the Cisco 7600.
Processor Redundancy. RPR provides an alternative to the High System
Availability (HSA) feature. HSA enables a system to reset and use a standby
Route Processor (RP) if the active RP fails. Using RPR, you can reduce
unplanned downtime because RPR enables a quicker switchover between an active
and standby RP if the active RP experiences a fatal error.
enhancement to RPR in which the standby RP is fully initialized.
SSO—Stateful Switchover. Enables applications and features
to maintain state information between an active and standby unit.
standby RP—An RP
that has been fully initialized and is ready to assume control from the active
RP should a manual or fault-induced switchover occur.
event in which system control and routing protocol execution are transferred
from the active RP to the standby RP. Switchover may be a manual operation or
may be induced by a hardware or software fault. Switchover may include transfer
of the packet forwarding function in systems that combine system control and
packet forwarding in an indivisible unit.
vIP—virtual IP address.
An IPv4 address. There must be only one virtual IP address for each configured
GLBP group. The virtual IP address must be configured on at least one GLBP
group member. Other GLBP group members can learn the virtual IP address from