User's Manual

Table Of Contents
538
Users Manual of CS-6306R
53.1.3.8 Adjusting the Timer
The routing protocol needs several timers to judge the transmission frequency of routing updates and how
long it takes for a route to become invalid. You can adjust these timers to make the performance of a routing
protocol more suitable for the requirements of network interconnecting.
You can also adjust the routing protocols to speed up the convergence time of the IPv6 algorithm and make
fast backup of the redundancy router, guaranteeing a maximum breakup for a terminal user when quick
recovery is needed. To adjust the timer, run the following command in RIPng configuration mode:
Command Purpose
timers holddown value
Means how long it takes for a route to be
removed from the routing table.
timers garbagevalue
Means how long it takes for a route to be
declared invalid.
timers updatevalue
Means the transmission frequency of routing
updates, whose unit is second.
53.1.3.9 Summarizing the Routes Manually
RIPng must summarize the routing information manually to reduce the number of the routes that interact with
neighbors. To summarize the routing information, run the following command in the RIPng configuration
mode:
Command Purpose
aggregate-address
ipv6-prefix/prefixlen
Summarizes the routing information.
53.1.3.10 Activating or Forbidding Horizontal Fragmentation
In normal cases, a router that connects the broadcast IPv6 network and uses the distance vector routing
protocol takes the horizontal fragmentation to reduce the possibility of route loopback. The horizontal
fragmentation blocks the routing information from being declared to the interface that receives this routing
information. In this way the communication between multiple routers can be optimized, especially when the
loopback is broken. However, this solution is not so good to those un-broadcast networks. In these networks,
you have to forbid horizontal fragmentation.
To activate or disable horizontal fragmentation, run the following commands in VLAN configuration mode:
Command Purpose
Ipv6 rip split-horizon
Activates horizontal fragmentation.
no ipv6 rip split-horizon
Forbids horizontal fragmentation.
By default, horizontal fragmentation is activated on those point-to-point interfaces and forbidden on those
point-to-multipoint interfaces.