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Bug resolved with Loop by unplugged UDC (Typ1a / Ethernet ) Connector ?

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rouven.heim
Level 1
Level 1

‎03-19-2003 11:04 AM - edited ‎03-02-2019 05:59 AM

Hi!

we want to use our existing Typ1 shielded twisted-pair (STP) cabling used for Token Ring networks for Fast-Ethernet.

The document "Shielded Twisted-Pair Cabling Support for Cisco Fast Ethernet

Products" (http://www.cisco.com/warp/public/cc/so/neso/ibso/ecampus/1040_pp.pdf) lists Catalyst 2950G-XX as a tested switch. Later in the document you can read the following:

"Users should be aware, however, of an important, unresolved condition that occurs on Catalyst 4XXX/29XXG/49XXG switches when 1) portfast is enabled and 2) a UDC connector remote from a switch port (for example, at the workstation end of the cable) is unplugged. During the time the switch is resolving the resulting loop, packets may be dropped on other ports of the same switch. This problem is currently unresolved. See bug ID CSCdu24117 for additional details."

I´ve looked at the bug ID and the product describet in the bug report is "ws-x4148" not 2950G-xx.

Now my question: Is this bug fixed with the 2950G-xx ?

It´s very important for me! Or do I have to chose Catalyst WS-3550-xx-SMI.

Thank you!

Rouven

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donewald
Level 6
Level 6

‎03-21-2003 07:06 AM

Rouven,

Looking at the defect comments it states that this only effects the Catalyst 4000 in 6.1.2, so you should not be effected by this issue with your 2950G. Here are the CLOSED comments for this defect.

Temporary spanning tree loops may occur when an STP cable with the

Universal Data Connector (UDC) is connected to a portfast enabled switch

port on a catalyst 4000 series switch. The spanning tree loop may occur

when the cable end remote from the switch port is unplugged, causing the

UDC to create a loopback on the port.

These temporary spanning tree loops can cause connectivity problems for

other hosts on the switch.

Disabling portfast fixes the problem. However, hosts using DHCP with

Windows 95 have problems if portfast is disabled, since by the time

spanning tree brings the port to forwarding, the DHCP session has timed

out. There are currently no other workarounds. Until a workaround is found

(if possible) customers should take care to insure that these connectors

are not exposed to inadvertent disconnections

Hope this helps you,

Don

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donewald
Level 6
Level 6

‎03-21-2003 07:06 AM

Rouven,

Looking at the defect comments it states that this only effects the Catalyst 4000 in 6.1.2, so you should not be effected by this issue with your 2950G. Here are the CLOSED comments for this defect.

Temporary spanning tree loops may occur when an STP cable with the

Universal Data Connector (UDC) is connected to a portfast enabled switch

port on a catalyst 4000 series switch. The spanning tree loop may occur

when the cable end remote from the switch port is unplugged, causing the

UDC to create a loopback on the port.

These temporary spanning tree loops can cause connectivity problems for

other hosts on the switch.

Disabling portfast fixes the problem. However, hosts using DHCP with

Windows 95 have problems if portfast is disabled, since by the time

spanning tree brings the port to forwarding, the DHCP session has timed

out. There are currently no other workarounds. Until a workaround is found

(if possible) customers should take care to insure that these connectors

are not exposed to inadvertent disconnections

Hope this helps you,

Don

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