You might have noticed that matching strictly based on values and masks covers only ACE statements that involve exact matches (either the eq port operation keyword or no Layer 4 port operations). For example, ACEs such as the following involve specific address values, address masks, and port numbers: access-list test permit ip 192.168.254.0 0.0.0.255 any access-list test permit tcp any host 192.168.199.10 eq www What about ACEs that use port operators, whe..
Routers store new LSPs in the link-state database and mark them for flooding. If the LSP is already present in the database, the router just acknowledges it and ignores it. The router sends the new LSP to its neighbors, which in turn flood to their neighbors and so on. Because Level 1 and Level 2 routers have their own link-state databases, Level 1 LSPs are flooded throughout the area; Level 2 LSPs are sent across all Level 2 adjacencies. The process of propagating LSPs diffe..
Unlike IGRP, EIGRP must establish neighbor relationships before updates are sent out. When an EIGRP process is configured on the router, the router begins to exchange EIGRP hello packets over the multicast address of 224.0.0.10. Neighbor relationships form between routers when they receive each other's hello packet. Over LAN broadcast media such as Ethernet, Token Ring, or FDDI, the hello packets are sent every 5 seconds. Over WAN multipoint interfaces with a bandwidth of T1 ..
This section illustrates the operation of the Cisco IS-IS restart mechanism, using the network diagram shown in Figure 5-8. Both R1 and R2 are Cisco IS-IS restart/NSF-capable and are interconnected via point-to-point links. • Assume using normal IS-IS procedures, R1 and R2 have synchronized their databases and are ready for forwarding. Suppose a forwarding path exists from "source" to "destination" passing through R1 and R2, and data traffic is being forw..
Modifying the Default RIP Parameters
There are several customizations that we can make to the default RIP configuration. You can modify the timers by using the timers command in the RIP configuration mode: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#ipv6 unicast-routing Router1(config)#ipv6 router rip RIP_PROC Router1(config-rtr)#timers 15 60 5 120 Router1(config-rtr)#exit Router1(config)#end Router1# You can change the default administrative ..
