Slow Telnet.

[peter.hoegh]

Hello all

Recently we had a unintended reboot of our maine router (Cisco 6506) It looked fine and looked like the reboot went smooth. We are now experiencing extremely slow Telnet access, slow login and "rubber keys" when we try to enter a command in the router. Serial connection is fine and the CLI is very responsive when you log in via. the console. 

The router is not high in memory or cpu usage. It's working fine on the network, not slow in ordinary work.    

The configuration on the router looks ok, this includes STP settings. We have no STP blocked ports. I have tried to reboot the unit. No result.

I am quit desperate so if you have any advice, please share.

Thanks in advance.

Peter      

[marce1000]

 - Try a traceroute from the operator(host - the one where telnet is initiated from)  to the router , check if the designated destination-path (trail) is as expected.

 M.

[peter.hoegh]

Hello Marce1000
As requested. A traceroute from my client machine to the router:



peterhoegh@MacBook-Pro-M1-5 ~ % traceroute 172.20.27.1

traceroute to 172.20.27.1 (172.20.27.1), 64 hops max, 52 byte packets

1 172.26.0.1 (172.26.0.1) 1.419 ms 0.847 ms 0.774 ms

2 172.26.64.1 (172.26.64.1) 0.585 ms * 1.162 ms

3 10.51.6.6 (10.51.6.6) 1.168 ms *

10.51.6.22 (10.51.6.22) 2.029 ms

peterhoegh@MacBook-Pro-M1-5 ~ %



It seems to be in order.

[Georg Pauwen]

Hello, 

can you post the output of:

show spanning-tree vlan 900

The idea is to find out which device is the root for that Vlan...

[peter.hoegh]

Hello Georg
As requested, output from “show spanning-tree vlan 900”

SW_Raadhus-S4.1_SK_new#show spanning-tree vlan 900

VLAN0900
Spanning tree enabled protocol rstp
Root ID Priority 4996
Address 64f6.9d1e.9440
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 4996 (priority 4096 sys-id-ext 900)
Address 64f6.9d1e.9440
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi1/48 Desg FWD 4 128.48 P2p
Gi2/11 Desg FWD 4 128.139 P2p
Gi2/20 Desg FWD 4 128.148 P2p
Gi2/48 Desg FWD 4 128.176 P2p
Gi3/1 Desg FWD 4 128.257 P2p
Gi3/2 Desg FWD 4 128.258 P2p Peer(STP)
Gi3/7 Desg FWD 4 128.263 P2p Peer(STP)
Gi3/11 Desg FWD 4 128.267 P2p Peer(STP)
Gi4/7 Desg FWD 4 128.391 P2p Peer(STP)
Te5/1 Desg FWD 2 128.513 P2p
Te6/1 Desg FWD 2 128.641 P2p
Gi8/1 Desg FWD 4 128.897 P2p Peer(STP)
Po11 Desg FWD 1 128.1291 P2p


SW_Raadhus-S4.1_SK_new#

[paul.driver]

.

[paul driver · Accepted solution]

Hello

Can you confirm what authentication method you are using?  Tacacs/Radius/local ?
Trying decreasing the timeout values of authorisation servers, and if applicable allow negating authorisation if authenticated.

radius-server timeout xx
tacacs-server timeout xx

aaa authorization exec xxxxxx  if-authenticated
aaa authorisation console

[mfanzilekhumalo]

Hi Peter, did you get any solution to your slow telnet? Was the telnet slow or it just took a while to respond after typing in the username and password. I have a similar issue on 2960x switches.