BGP-learned defaults are injected into EIGRP via redistribution. The 0/0 metric needs to be converted into an EIGRP-compatible metric by using the default-metric router subcommand. The configuration for RTA in Example 12-51 will inject its default with a high metric in such a way that the internal router (RTG) always gets a lower metric via RTF. Example 12-51. Using EIGRP as the IGP: RTA Configuration router eigrp 1 redistribute bgp 3 route-map DEFAULT_ONLY passive-interfac..
All the options for IP forwarding (routing) in this chapter had one thing in common: The destination IP address in the packet header was the only thing in the packet that was used to determine how the packet was forwarded. Policy routing allows a router to make routing decisions based on information besides the destination IP address. Policy routing’s logic begins with the ip policy command on an interface. This command tells IOS to process incoming packets with different l..
IGMPv1 Host Membership Report Functions
Hosts use IGMPv1 Host Membership Report message to reply to IGMP Queries and inform the router(s) of their desire to receive multicasts. Multicast hosts use IGMPv1 Host Membership Report messages to communicate to a local router for which multicast groups they want to receive traffic. In IGMPv1, a host sends an IGMPv1 Host Membership Report under the following two conditions: ■ When a host receives an IGMPv1 Query from a local router, it is supposed to send an IGMPv1 Hos..
In fact, Cisco routers have DNS name resolution enabled by default. However, since there is no default nameserver, the router will attempt to use the local broadcast address, 255.255.255.255, until you explicitly configure a proper nameserver. This means that the ip domain-lookup configuration command in the example is necessary only if someone has explicitly disabled DNS on the router. After you configure the router with a valid nameserver, you can access any hostname that ..
An end-user workstation is usually connected to a switch port in the access layer. If the workstation is powered off and then turned on, the switch will sense that the port link status has gone down and back up. The port will not be in a usable state until STP cycles from the Blocking state to the Forwarding state. With the default STP timers, this transition takes at least 30 seconds (15 seconds for Listening to Learning, and 15 seconds for Learning to Forwarding). Therefore..
