Riverstone Networks WICT1-12 User Manual

Riverstone Networks RS Switch Router User Guide   Release 8.0   11-17

IP Routing Configuration Guide

Setting Memory Thresholds  

The default memory thresholds are shown in  

.  You can use the 

 command to change the thresholds.

When a level-1, level-2, or level-3 threshold is reached, the RS may delete routes in the RIB or not add new routes to 
the RIB, depending upon the routing protocol. When threshold level-4 is reached (by default, 75% of available memory 
used by the RIB), no new routes are added.

 shows what actions the RS takes in updating the RIB when each threshold is reached.

Table 11-1 Default Memory Thresholds

0

12

03

14

05

62

07

64

Table 11-2 RIB Updates When Memory Threshold is Reached

OSPF/
IS-IS

level-1
level-2
level-3
level-4

Updates are processed as usual.

RIP

level-1

A new RIP route is added only if it is the only RIP route to 
the given destination.

Maximum of 2 routes allowed to a given destination. If there 
are more than 2 routes to a given destination, the least 
preferred route(s) are deleted.

level-2

A new RIP route is added only if is an active RIP route to the 
given destination.

level-3

Only one route is allowed to a given destination. If there is 
more than one route to a given destination, the least preferred 
route is deleted.

level-4

No new routes are added.