In some cases, a routing policy may need to remove one string from the COMMUNITY PA, or even delete the entire COMMUNITY PA. This can be accomplished with a route map as well, using the set command. Removing the entire COMMUNITY is relatively simple: include the set community none command in a route-map clause, and all routes matched by that clause will have their COMMUNITY PA removed. For example, Example 13-11 lists a route-map react-tocomm route map on each router. In that..
Convergence in a Frame-Mode MPLS Network
An important aspect in MPLS network design is the convergence time of the network. Some MPLS applications (for example, an MPLS/VPN or BGP design based on MPLS) do not work correctly unless a labeled packet can be sent all the way through from the ingress Edge-LSR to the egress Edge-LSR. In these applications, the convergence time needed by an Interior Gateway Protocol (IGP) to converge around a failure in the core network could be increased by the label propagation delay. I..
Even though this book is about routing protocols and how to troubleshoot routing-related problems, we would like to briefly mention in this introductory chapter that the high-speed forwarding requirements in today's networks have led to ingenious ways of packet processing on routers that extend beyond basic decision-making based on the IP routing table. The routing table remains critical for routing guidance, but instead of using the contents of the routing table directly, ro..
Use the logging rate-limit configuration command to limit the number of syslog packets sent to your server: Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#logging host 172.25.1.1 Router(config)#logging rate-limit 30 except warnings Router(config)#end Router# To rate limit the number of log messages sent to the console port, use the following command: Router#configure terminal Enter configuration commands, one per..
Changing the Network Type on an Interface
OSPF supports several different types of logical networks on interfaces. The default values are often exactly what you want, but it is sometimes useful to change them: Router9#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router9(config)#interface FastEthernet0/0 Router9(config-if)#ip ospf network ? broadcast Specify OSPF broadcast multi-access network non-..
