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EIGRP Query Storm - Printable Version

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EIGRP Query Storm - viets - 09-10-2009

Hello,

I have the following Problem with the topology below. If the connection between as1_r1 and as1_r6 or as1_r3 and as1_r7 flaps one time, all routers gets a high CPU load and the route 10.1.16.0/21 (the summary is configured on as1_r6 and as1_r7 on the serials) is in eigrp active state all time, because every router queries for this route....

One solution is to shut down one serial on as1_r{1,2,3} or to configure as1_r6 or as1_r7 as a stub router, but I think there should be another solution.

If needed, I could post the configurations...

Thanks in Advance
Viets

[code]as1_r1#sh ip eigrp topology  active
IP-EIGRP Topology Table for AS(1)/ID(91.189.94.4)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

A 10.1.16.0/21, 1 successors, FD is Inaccessible, QR
    3 replies, active 00:00:00, query-origin: Successor Origin
        via 10.1.1.11 (Infinity/Infinity), Serial1/0, serno 59115
        via 10.1.16.1 (Infinity/Infinity), r, Serial1/1, serno 59125
        via 10.1.1.2 (Infinity/Infinity), r, R, FastEthernet0/0, serno 59122, anchored
        via 10.1.1.10 (Infinity/Infinity), Serial1/0, serno 59124
      Remaining replies:
         via 10.1.1.3, r, FastEthernet0/0
[/code]

[Image: topology3.png]

[code]
as1_r1#sh ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.1.1.1        YES NVRAM  up                    up       
Serial1/0                  10.1.1.9        YES NVRAM  up                    up     
Serial1/1                  10.1.0.1        YES TFTP   up                    up     
Loopback0                  10.1.0.1        YES NVRAM  up                    up     
Loopback1                  91.189.94.4     YES NVRAM  up                    up     

as1_r2#sh ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.1.1.2        YES NVRAM  up                    up     
Serial1/0                  10.1.1.10       YES NVRAM  up                    up         
Loopback0                  10.1.0.2        YES NVRAM  up                    up   

as1_r3#sh ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.1.1.3        YES NVRAM  up                    up     
Serial1/0                  10.1.1.11       YES NVRAM  up                    up       
Serial1/2                  10.1.0.3        YES TFTP   up                    up     
Loopback0                  10.1.0.3        YES NVRAM  up                    up     
Loopback1                  10.1.8.1        YES NVRAM  up                    up     

as1_r6#sh ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.1.17.1       YES NVRAM  up                    up       
Serial1/0                  10.1.16.1       YES TFTP   up                    up     
Loopback0                  10.1.16.1       YES NVRAM  up                    up 

as1_r7#sh ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.1.17.2       YES NVRAM  up                    up       
Serial1/0                  10.1.16.2       YES TFTP   up                    up     
Loopback0                  10.1.16.2       YES NVRAM  up                    up

[/code]



Re: EIGRP Query Storm - viets - 09-10-2009

Hello,

I've found the problem, the summaries were configured with the administrative distance of 220, this is higher than 90 from eigrp so this was the bug...

this thread can be closed/deleted...

greetings
Viets