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Note In BGP Version 3, MED is known as Inter-AS_Metric. Unlike local preference, the MED attribute is exchanged between ASs, but a MED attribute that comes into an AS does not leave the AS. When an update enters the AS with a certain MED value, that value is used for decision making within the AS. When BGP sends that update to another AS, the MED is reset to 0. Unless otherwise specified, the router compares MED attributes for paths from external neighbors that are in the same AS. If you want MED attributes from neighbors in other ASs to be compared, you must configure the bgp always-compare-med command.

The second two neighbor remote-as commands establish BGP connections with confederation peers 65050 and 65070. The last neighbor remote-as command establishes an EBGP connection with AS 600. 4 remote-as 500 The neighbor remote-as command establishes an EBGP connection with Router C. Router A is unaware of AS 65050, AS 65060, or AS 65070. Router A only has knowledge of AS 500. Route Reflectors Route reflectors are another solution for the explosion of IBGP peering within an AS. As described earlier in the section “Synchronization,” a BGP speaker does not advertise a route learned from another IBGP speaker to a third IBGP speaker.

Figure 3-19 Use of loopback interfaces. 150 212 1 1 E0 192 208 102 E1 IBGP 190 225 11 1 Router A Router B E3 E2 AS 100 In Figure 3-19, Routers A and B are running IBGP within AS 100. If Router A were to specify the IP address of Ethernet interface 0, 1, 2, or 3 in the neighbor remote-as router configuration command, and if the specified interface were to become unavailable, Router A would not be able to establish a TCP connection with Router B. Instead, Router A specifies the IP address of the loopback interface that Router B defines.

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