ZXR10 GER (V2.6.03) General Excellent Router User Manual Volume-I
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Confidential and Proprietary Information of ZTE CORPORATION
of routers that can be traversed in a route. ZXR10 GER supports
RIPv1 and RIPv2 completely (RIPv2 is used by default).
Routing Updates
RIP sends routing-update messages at regular intervals and
when network topology changes. When a router receives a
routing update that includes changes to an entry, it updates its
routing table to reflect the new route. The metric value for path
is increased by 1 and sender is indicated as next hop. RIP
routers maintain only best route (the route with the lowest
metric value) to a destination.
After updating its routing table, router immediately begins
transmitting routing updates to inform other network routers of
the change. These updates are sent independently of regularly
scheduled updates that RIP routers send.
RIP Routing Metric
RIP uses a single routing metric (hop count) to measure distance
between source and a destination network. Each hop in a path
from source to destination is assigned a hop count value, which
is typically 1.
When a router receives a routing update that contains a new or
changed destination network entry, the router adds 1 to metric
value indicated in update and enters the network in the routing
table. The IP address of the sender is used as the next hop.
RIP Stability Features
RIP prevents routing loops from continuing indefinitely by
implementing a limit on number of hops allowed in a path from
source to a destination. The maximum number of hops in a path
is 15. If a router receives a routing update that contains a new
or changed entry and if increasing the metric value by 1 causes
metric to be infinity (that is, 16), the network destination is
considered unreachable.
The downside of this stability feature is that it limits the
maximum diameter of a RIP network to less than 16 hops. RIP
includes a number of other stability features that are common to
many routing protocols. These features are designed to provide
stability despite potentially rapid changes in a network’s
topology. For example, RIP implements the split horizon and
hold-down mechanisms to prevent incorrect routing information
from being propagated.
RIP Topology
Single Routing
Metric
Routing Loops
Stability
Features
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