Area Design of Integrated IS-IS Routers

When designing a network, you have to compromise. Typically, the trade-off is between reliability and speed. What is most efficient for the network is determined by the requirements of the network and the resources available.  In designing Integrated IS-IS networks and the hierarchical design, you need to consider the data flow in addition to the resources required by the routing protocol. Tuning the update process might be sufficient, although this results in compromis..

IS-IS and Default Routes

The purpose of the default route in any routing protocol is to forward traffic to destinations that are not in the router's routing table. It is not possible for all the routers in a network to have full Internet routes. For this purpose, routers without full routes to all the destinations forward traffic to the default originating router.   Level 1 routers never maintain information about any destination that is outside their area, so all level 1 routers merely s..

Setting the IP Source Address for SNMP Traps

To set the default IP source address for all traps leaving a router, use the following configuration command: Router#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#snmp-server host 172.25.1.1 ORATRAP Router(config)#snmp-server trap-source loopback0 Router(config)#end Router# Normally, when you enable SNMP traps to a remote server, that server will see the source IP address of the router's closest interface. However, this..

Configuring DLCI Priority Levels

DLCI priority level is a legacy traffic management tool that allows users to prioritize multiple parallel Frame Relay DLCIs based on the types of Frame Relay traffic that are carried. DLCI priority level can be used to alleviate congestion for certain types of traffic by allowing users to define different DLCIs for different categories of traffic based on traffic priorities. For example, DLCI priority level is useful in situations in which delay-sensitive traffic is mixed wit..

Filtering Routes with EIGRP

You can filter the routes that EIGRP receives on a particular interface (or subinterface) using the distribute-list in command as follows: Router2#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router2(config)#access-list 34 deny 192.168.30.0 Router2(config)#access-list 34 permit any Router2(config)#router eigrp 55 Router2(config-router)#distribute-list 34 in Serial0.1 Router2(config-router)#exit Router2(config)#end Router2# EIGRP also..