ASA 5510 connectivity issues to 3550 Catalyst

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Jan 13th, 2009
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I am having a nightmare trying to connect my shiny new ASA 5510 to an old Cat 3550 switch. The ASA port shows up/up but receives no packets at all. As soon as I put the cable back in to the old PIX515E it works straight away, making me believe this is a bug between the 5510 and the 3550. I have tried countless combinations of speed/duplex, and I've upgraded both the switch software and ASA software to latest levels. I have even tried a different ASA. The only way I can get the link between the ASA and the switch to come up is to place a "Linksys residential cable router with 4-port switch" in between!!! Clearly the 5510 and 3550 do not like negotiating a link for whatever reason.

Any help will be massively appreciated.

Thanks, Mark

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handsy Wed, 01/14/2009 - 02:42
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Thanks for your reply. As mentioned, I have tried countless combinations of speed/duplex and I am definitely not using x-over cable :(


What software level is your ASA/3550 on? ...and are your ASAs the 5510 variety?

handsy Wed, 01/14/2009 - 02:52
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I can't do full config for switch as I don't own that end, but I was given the interface config:


interface FastEthernet0/47

switchport access vlan 14

switchport mode access

speed 100

duplex full

no snmp trap link-status

spanning-tree portfast


..and the ASA port config is as follows:

interface Ethernet0/3

description Corporate Network Link

speed 100

duplex full

nameif corporate

security-level 5

ip address x.x.x.x 255.255.255.192


The ASA is a 5510 running 7.2(4) and the switch is a WS-C3550-48-SMI running 12.2(44)SE3.

handsy Wed, 01/14/2009 - 04:40
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Yeah did that too, and the ASA end comes up saying "Half/100" !!

Cable is perfectly fine to the PIX515E so it's not a cable problem.

Thanks for your help anyway.

If they can;t negotiate the duplex - this means the "frame link pulse" is not 100% OR you have mdix on the switch port, which sometimes breaks the neogtiation with static speed.duplex settings.


Can you have the owner of the switch remove mdix on the switch port and test again?

handsy Thu, 01/15/2009 - 00:16
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Hi, is mdix a config setting? If it is, I can't find that setting in any command reference. Can you advise? Thanks for all your help so far.

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