Hi,
Bit of a strange one this.
The NIC is an intergrated 82566DM on an Intel DQ965GF Mainboard -305 rev - bios 5585.
OS is XP Pro SP2.
NIC Driver is the latest Intel release 9.6.31.0
Switch is a Catalyst 3500XL 100/100/1000 with latest R16 ISO bootloader etc.
If you set the switch to "Auto" and the NIC Speed and Duplex to "Auto" (Which is the shipping default), then it constantly drops and re-establishes the network connection. See below :
2d00h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down
2d00h: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up
2d00h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up
2d00h: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down
2d00h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down
2d00h: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up
2d00h: %LINEP
2d00h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down
2d00h: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up
2d00h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up
2d00h: %RTD-1-LINK_FLAP: FastEthernet0/1 link down/up 5 times per min
2d00h: %RTD-1-LINK_FLAP: FastEthernet0/1 link down/up 5 times per min
2d00h: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down
2d00h: %LINEPROTO-5-UPDOWN: Line protocol on Int state to down
2d00h: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up
2d00h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed
If you configure the NIC and Switch manually to match speed and duplex then the problem goes away.
Unforunately these NIC's ship as AUTO.
Anyone seen this at all, any suggestions to whether or not its the NIC or the Switch at fault.
If I attach the NIC to a Cisco Catalyst 2950XL then the problem is not present.
Any sugggestions are more than welcome - a d m i n [ a t ] b r o w n z [ d o t ] o r g