The abilities to control which devices get addresses and track the address assignments for auditing purposes are important issues that can be accomplished using DHCPv6. Ironically, privacy is another reason that DHCPv6 could be a good idea. Normally IPv6 addresses contain the MAC address, a unique ID that can be linked back to a specific system. DHCPv6 could be used to break the link between the MAC address and the Layer 3 address. Stateless DHCPv6 is a m..
Identifying and Filtering Routes Based on the NLRI
To restrict the routing information that the router learns or advertises, you can filter based on routing updates to or from a particular neighbor. The filter consists of a prefix list (or access list) that is applied to updates to or from a neighbor. In Figure 11-2, RTD in AS2 is originating network 192.68.10.0/24 and is sending it to RTF. RTF will pass the update to RTA via IBGP, which in turn will propagate it to AS1. By doing so, AS3 could become a transit AS, advertising..
When a router receives a CSNP from a neighbor, and it notices that the CSNP is missing part of the database, the router sends a partial sequence number PDU packet (PSNP) to request a newer copy of the LSP. This is similar to the OSPF link-state request packet. The PSNP also acknowledges the receipt of the CSNP. PSNP describes the LSP by its header, just like a CSNP. Unlike the CSNP, however, the PSNP holds information only about the requested LSP, not about all ..
Table 6-3 illustrates that there are actually five STP states
After the bridges have classified their ports as Root, Designated, or non-Designated, creating a loop-free topology is straightforward: Root and Designated Ports forward traffic, whereas non-Designated Ports block traffic. Although Forwarding and Blocking are the only two states commonly seen in a stable network, Table 6-3 illustrates that there are actually five STP states. Table 6-3. STP States State Purpose Forwarding Sendin..
Virtual templates provide another way of configuring a central dialup host router: dialhost#configure terminal Enter configuration commands, one per line. End with CNTL/Z. dialhost(config)#username Router1 password dialpassword dialhost(config)#interface BRI0/0 dialhost(config-if)#no ip address dialhost(config-if)#encapsulation ppp dialhost(config-if)#dialer pool-member 1 dialhost(config-if)#isdn switch-type basic-ni dialhost(config-if)#isdn point-to-point-setup dialho..
