EIGRP Feasible Distance.

Unanswered Question
Mar 29th, 2009

Hi, anyone have any public source or document that states the maximum number of FSs that will be kept in the topology table. Many sources state up to 6 but I managed to POC and found at least 8, and there could be more due to recent IOS features. Thanks in advance.


RT1#sh ip eigrp neighbors

IP-EIGRP neighbors for process 100

H Address Interface Hold Uptime SRTT RTO Q Seq

(sec) (ms) Cnt Num

15 25.25.25.2 Se3/3 14 00:00:12 932 5000 0 22

14 24.24.24.2 Se3/2 10 00:00:12 1968 5000 0 25

13 23.23.23.2 Se3/1 10 00:00:12 1 3000 0 28

12 22.22.22.2 Se3/0 10 00:00:12 1720 5000 0 27

11 21.21.21.2 Se2/3 14 00:00:14 1944 5000 0 26

10 20.20.20.2 Se2/2 14 00:00:14 1280 5000 0 24

9 19.19.19.2 Se2/1 10 00:00:14 1236 5000 0 23

8 18.18.18.2 Se2/0 12 00:00:14 844 5000 0 29

7 17.17.17.2 Et1/3 14 00:00:16 224 1344 0 21

6 16.16.16.2 Et1/2 10 00:00:16 223 1338 0 20

5 15.15.15.2 Et1/1 11 00:00:16 88 528 0 19

4 14.14.14.2 Et1/0 12 00:00:16 640 3840 0 18

3 13.13.13.2 Et0/3 12 00:00:18 256 1536 0 17

2 12.12.12.2 Et0/2 11 00:00:18 88 528 0 16

1 11.11.11.2 Et0/1 12 00:00:18 88 528 0 15

0 10.10.10.2 Et0/0 10 00:00:18 220 1320 0 14

RT1#

RT1#sh ip route eigrp

172.16.0.0/24 is subnetted, 1 subnets

D 172.16.1.0 [90/409600] via 10.10.10.2, 00:00:11, Ethernet0/0

[90/409600] via 11.11.11.2, 00:00:11, Ethernet0/1

[90/409600] via 12.12.12.2, 00:00:11, Ethernet0/2

[90/409600] via 13.13.13.2, 00:00:11, Ethernet0/3

RT1#

RT1#sh ip eigrp topology | b 172.16.1.0

P 172.16.1.0/24, 4 successors, FD is 409600

via 10.10.10.2 (409600/128256), Ethernet0/0

via 11.11.11.2 (409600/128256), Ethernet0/1

via 12.12.12.2 (409600/128256), Ethernet0/2

via 13.13.13.2 (409600/128256), Ethernet0/3

via 14.14.14.2 (409600/128256), Ethernet1/0

via 15.15.15.2 (409600/128256), Ethernet1/1

via 16.16.16.2 (409600/128256), Ethernet1/2

via 17.17.17.2 (409600/128256), Ethernet1/3

via 18.18.18.2 (2297856/128256), Serial2/0

via 19.19.19.2 (2297856/128256), Serial2/1

via 20.20.20.2 (2297856/128256), Serial2/2

via 21.21.21.2 (2297856/128256), Serial2/3

via 22.22.22.2 (2297856/128256), Serial3/0

via 23.23.23.2 (2297856/128256), Serial3/1

via 24.24.24.2 (2297856/128256), Serial3/2

via 25.25.25.2 (2297856/128256), Serial3/3

RT1#


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huangedmc Fri, 04/10/2009 - 10:37

According to Routing TCP/IP V1, 2nd edition:


"The maximum number of routes over which EIGRP can load balance is set w/ the maximum-paths paths command. paths may be any number from 1 to 16 in IOS 12.3(2)T and later 12.3(T) releases and any number from 1 to 6 in earlier versions. The default for all versions is 4." (p.302)


In IOS XR command reference I found, it says up to 32 routes:


http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.7/routing/command/reference/rr37egp.html#wp999114



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