Re: AAA config problem in C4510R

schakra · ‎12-05-2006

Hi,

I'm configuring AAA for 4510 switch.All other routers & switches(29xx) are working properly with AAA server.However for 4510 there is a problem in authentication neogotiation with AAA server.Below is AAA config and debug

aaa new-model

aaa authentication login SWAAA group tacacs+ line

aaa authorization exec SWAAA group tacacs+ local

aaa session-id common

tacacs-server host x.x.y.y key 7 110A0A00151C0E18

086431: 8w3d: AAA: parse name=tty2 idb type=-1 tty=-1

086432: 8w3d: AAA: name=tty2 flags=0x11 type=5 shelf=0 slot=0 adapter=0 port=2 channel=0

086433: 8w3d: AAA/MEMORY: create_user (0x18558BD8) user='NULL' ruser='NULL' ds0=0 port='tty2' rem_addr='x.x.8.3' auth

en_type=ASCII service=LOGIN priv=1 initial_task_id='0', vrf= (id=0)

086434: 8w3d: AAA/AUTHEN/START (3464589231): port='tty2' list='SWAAA' action=LOGIN service=LOGIN

086435: 8w3d: AAA/AUTHEN/START (3464589231): found list SWAAA

086436: 8w3d: AAA/AUTHEN/START (3464589231): Method=tacacs+ (tacacs+)

086437: 8w3d: TAC+: send AUTHEN/START packet ver=192 id=3464589231

086438: 8w3d: TAC+: Using default tacacs server-group "tacacs+" list.

086439: 8w3d: TAC+: Opening TCP/IP to x.x.y.y/49 timeout=5

086440: 8w3d: TAC+: Opened TCP/IP handle 0x18753920 to x.x.y.y/49

086441: 8w3d: TAC+: x.x.y.y(3464589231) AUTHEN/START/LOGIN/ASCII queued

086442: 8w3d: TAC+: (3464589231) AUTHEN/START/LOGIN/ASCII processed

086443: 8w3d: TAC+: received bad AUTHEN packet: type = 0, expected 1

086444: 8w3d: TAC+: Invalid AUTHEN/START/LOGIN/ASCII packet (check keys).

086445: 8w3d: TAC+: Closing TCP/IP 0x18753920 connection to x.x.y.y/49

086446: 8w3d: TAC+: Using default tacacs server-group "tacacs+" list.

086447: 8w3d: AAA/AUTHEN (3464589231): status = ERROR

086448: 8w3d: AAA/AUTHEN/START (3464589231): Method=LINE

086449: 8w3d: AAA/AUTHEN (3464589231): status = GETPASS

086450: 8w3d: AAA/AUTHEN/CONT (3464589231): continue_login (user='(undef)')

086451: 8w3d: AAA/AUTHEN (3464589231): status = GETPASS

086452: 8w3d: AAA/AUTHEN/CONT (3464589231): Method=LINE

086453: 8w3d: AAA/AUTHEN (3464589231): status = PASS

086454: 8w3d: AAA/MEMORY: dup_user (0x18753770) user='NULL' ruser='NULL' ds0=0 port='tty2' rem_addr=x.x.y.yauthen_

type=ASCII service=ENABLE priv=15 source='AAA dup enable'

086455: 8w3d: AAA/AUTHEN/START (453338276): port='tty2' list='' action=LOGIN service=ENABLE

086456: 8w3d: AAA/AUTHEN/START (453338276): non-console enable - default to enable password

086457: 8w3d: AAA/AUTHEN/START (453338276): Method=ENABLE

086458: 8w3d: AAA/AUTHEN (453338276): status = GETPASS

086459: 8w3d: AAA/AUTHEN/CONT (453338276): continue_login (user='(undef)')

086460: 8w3d: AAA/AUTHEN (453338276): status = GETPASS

086461: 8w3d: AAA/AUTHEN/CONT (453338276): Method=ENABLE

086462: 8w3d: AAA/AUTHEN (453338276): status = PASS

086463: 8w3d: AAA/MEMORY: free_user (0x18753770) user='NULL' ruser='NULL' port='tty2' rem_addr=x.x.y.y authen_type=

ASCII service=ENABLE priv=15

Thanks,

Sourav

m.sir · ‎12-06-2006

Could you try enter keys on ACS and on switch again??? it looks that keys are not matching ... Sometimes eventhough keys are entered correctly on ACS re-entering of keys is needed

M.

a.kiprawih · ‎12-06-2006

086444: 8w3d: TAC+: Invalid AUTHEN/START/LOGIN/ASCII packet (check keys).

Switch could be using different shared secret key as what is configured in AAA (for AAA client) - due to extra characters or key completely wrong.

Check the failed authentication log (reason/solution) in AAA Server for mismatch key:

http://www.cisco.com/en/US/products/sw/secursw/ps2086/products_user_guide_chapter09186a008007dee6.html

*look for mistmatch key at the end of page

HTH

AK