Flooding Over Point-to-Point Links
A PDU is transmitted to the neighbor by an IS after an ISH is received from the neighbor. The purpose of this is to determine whether the neighbor is a level 1 or a level 2 intermediate system. After the neighbor is determined, the router then sends the CSNP on the point-to-point link. CSNPs are sent only the first time for the synchronization of a database. If the neighbor router discovers that it needs a newer instance of the LSP, it can request the LSP via th..
When you first receive a Catalyst from Cisco, it has no password set. In other words, the password is <ENTER> to enter both the EXEC and privilege modes. Your first task as a conscientious network administrator should be to change the passwords to the unit. This helps to prevent unauthorized children in adult form from modifying the Catalyst and disrupting your network. Example 4-11 shows a Catalyst session where the user changes the EXEC and enable passwords. The user ..
802 1x Port-Based Authentication Example
In Example 16-4, two RADIUS servers are located at 10.1.1.1 and 10.1.1.2. Switch ports Fast Ethernet 0/1 through 0/40 will use 802.1x for port-based authentication. When authenticated, the end users will be associated with VLAN 10.
Here are some useful commands for looking at the status of a dial backup link. For dial backup that uses the floating static or dialer watch type configurations, you can use the show dialer command: Router1#show dialer For dial configurations that use the backup interface configuration, you can use the show backup command: Router1#show backup And, for backup configurations that use ISDN, you can get some additional information from the show isdn status, show isdn active, ..
Cisco routers have several useful debug features that you can use to isolate multicast problems. The first is a general command that shows how the router maintains its multicast routing tables when it hears from sources and group members: Router#debug ip mrouting You can watch the actual multicast packets for a particular group using the command: Router#debug ip mpacket 239.5.5.55 And the other commonly useful multicast debug command looks specifically at IGMP information..
