From: matijevi@bellsouth.net
Date: Wed Feb 19 2003 - 13:18:46 GMT-3
I have enabled EIGRP on 2 routers placing a loopback and ethernet interface
only into the process.
r3#sh ip eigrp topology
IP-EIGRP Topology Table for AS(35)/ID(172.16.103.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 172.16.32.0/22, 1 successors, FD is 281600
via Connected, Ethernet0/0
P 172.16.105.0/24, 1 successors, FD is 409600
via 172.16.35.5 (409600/128256), Ethernet0/0
P 172.16.103.0/24, 1 successors, FD is 128256
via Connected, Loopback0
r5#sh ip eigrp topology
IP-EIGRP Topology Table for AS(35)/ID(172.16.35.5)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 172.16.32.0/22, 1 successors, FD is 281600
via Connected, Ethernet0
P 172.16.105.0/24, 1 successors, FD is 128256
via Connected, Loopback105
P 172.16.103.0/24, 1 successors, FD is 409600
via 172.16.35.3 (409600/128256), Ethernet0
How is the FD derived from the loopback on a local router, when that loopback
is placed in EIGRP? The table shows FD is 128256. How is this number derived?
Also, how is the other numbers derived? Finally I remeber reading in Doyle's
book that the first number in parenthesis is the metric calculated by the
local router to the destination, and the second number in the partenthesis is
the metric advertised by the neighbor, why is it using the loopback metric, as
the advertised metric, is it because thats the lowest metric calculated by the
dual algorithm?, I just want to know exactly how these numbers are calculated
if I have a 10mb connection between R3 and R5?
Sincerely,
John
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