09-10-2009, 08:51 AM
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
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[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]
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]
[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
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