03-28-2008 04:52 AM - edited 03-03-2019 09:19 PM
Hello,
Yesterday i was looking one of our router's EIGRP Topology table and i found out some interesting entries as you can see below from the output of the show ip eigrp topology all-links command:
P 172.16.230.33/32, 0 successors, FD is Inaccessible, serno 0
P 10.100.104.112/32, 1 successors, FD is 3845120, serno 33721
via Rstatic (3845120/0)
P 172.16.230.42/32, 1 successors, FD is 20512000, serno 27610
via Rconnected (20512000/0)
P 172.16.230.40/30, 1 successors, FD is 20512000, serno 27611
via Connected, Serial2/3
P 10.100.20.201/32, 1 successors, FD is 3845120, serno 33712
via Rstatic (3845120/0)
via 172.16.230.246 (3847680/28160), Serial4/3.100
Can anyone explain to me what does the entry "via Rstatic" mean? The relevant entries are static route on the same router. I also noticed the line with the phrase "FD is Inaccessible"...What does this mean? Finally the word "serno" at the end os some lines is does indicate something?
Thanks in advance!
Solved! Go to Solution.
03-28-2008 05:51 AM
"FD is Inaccessible" means there is a route in the table with a better administrative distance, so while EIGRP has a route, it's not installing the route in the local RIB.
The "serno" is the serial number of the topology table entry. This is a local number used in the reliable transmission of topology table entries between EIGRP neighbors. When a route is transmitted, the sending router keeps a list of the serial numbers contained in the packet. When the packet is acknowledged, this list of serial numbers is used to modify the states of the affected routes in the topology table.
:-)
Russ
03-28-2008 05:14 AM
Rstatic would mean that the route has been redistributed into EIGRP
FD is inaccessible -- This means the prefix entry in the routing table is not via EIGRP though EIGRP has lernt it but the RT chose to install the route by some other routing protocol (static,connected,ospf etc)
serno is a pointer to a doubly linked serial number for the route. This is used by an internal (and proprietary) mechanism for tracking the correct route information in a rapidly changing topology.
HTH
Narayan
03-28-2008 05:14 AM
John
In the EIGRP topology table the Rstatic indicates a prefix learned by EIGRP through redistribution of static routes. "FD is Inaccessible" means that the metric for the prefix is set to infinity and that the router should not forward packets to this table entry.
HTH
Rick
03-28-2008 05:16 AM
03-28-2008 05:51 AM
"FD is Inaccessible" means there is a route in the table with a better administrative distance, so while EIGRP has a route, it's not installing the route in the local RIB.
The "serno" is the serial number of the topology table entry. This is a local number used in the reliable transmission of topology table entries between EIGRP neighbors. When a route is transmitted, the sending router keeps a list of the serial numbers contained in the packet. When the packet is acknowledged, this list of serial numbers is used to modify the states of the affected routes in the topology table.
:-)
Russ
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