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General Troubleshooting for 10/100/1000 Mbps NICs

Someone has the problem that:
the Gig switch port not working set 100/full, he said: “I do many internet turn ups and one of the providers I work with always hands off the internet hardcoded to 100 full duplex.


If I have to patch it through a gig switch it comes up 100 half duplex on the switch side. If I hard code the speed or duplex at all the interface does not come up. If I call and have the provider and have them set their side Auto then both come up fine 1000/full. For the most part this has come up on 2960x/s or 3750 switches(I use the switch WS-C2960X-48LPD-L and WS-C3750X-24T-L). The product the provider is using is ADVA FSP150CCF.”

Below is the Autonegotiation Valid Configuration Table, can give the answer to this question!

Speed determination issues can result in no connectivity. However, issues with autonegotiation of duplex generally do not result in link establishment issues. Instead, autonegotiation issues mainly result in performance-related issues. The most common problems with NIC issues deal with speed and duplex configuration. Table 1 summarizes all possible settings of speed and duplex for FastEthernet NICs and switch ports.

Note: This section is only applicable for 10/100/1000 Mbps (1000BASE-T) NICs, and not 1000BASE-X NICs.

Table 1—Autonegotiation Valid Configuration

Configuration NIC (Speed/Duplex) Configuration Switch (Speed/Duplex) Resulting NIC Speed/Duplex Resulting Catalyst Speed/Duplex Comments
AUTO AUTO 1000 Mbps, Full-duplex 1000 Mbps, Full-duplex Assuming maximum capability of Catalyst switch, and NIC is 1000 Mbps, full-duplex.
1000 Mbps, Full-duplex AUTO 1000 Mbps, Full-duplex 1000 Mbps, Full-duplex Link is established, but the switch does not see any autonegotiation information from NIC. Since Catalyst switches support only full-duplex operation with 1000 Mbps, they default to full-duplex, and this happens only when operating at 1000 Mbps.
AUTO 1000 Mbps, Full-duplex 1000 Mbps, Full-duplex 1000 Mbps, Full-duplex Assuming maximum capability of NIC is 1000 Mbps, full-duplex.
1000 Mbps, Full-duplex 1000 Mbps, Full-duplex 1000 Mbps, Full-duplex 1000 Mbps, Full-duplex Correct Manual Configuration
100 Mbps, Full-duplex 1000 Mbps, Full-duplex No Link No Link Neither side establishes link, due to speed mismatch
100 Mbps, Full-duplex AUTO 100 Mbps, Full-duplex 100 Mbps, Half-duplex Duplex Mismatch 1
AUTO 100 Mbps, Full-duplex 100 Mbps, Half-duplex 100 Mbps, Full-duplex Duplex Mismatch 1
100 Mbps, Full-duplex 100 Mbps, Full-duplex 100 Mbps, Full-duplex 100 Mbps, Full-duplex Correct Manual Configuration2
100 Mbps, Half-duplex AUTO 100 Mbps, Half-duplex 100 Mbps, Half-duplex Link is established, but switch does not see any autonegotiation information from NIC and defaults to half-duplex when operating at 10/100 Mbps.
10 Mbps, Half-duplex AUTO 10 Mbps, Half-duplex 10 Mbps, Half-duplex Link is established, but switch does not see Fast Link Pulse (FLP) and defaults to 10 Mbps half-duplex.
10 Mbps, Half-duplex 100 Mbps, Half-duplex No Link No Link Neither side establishes link, due to speed mismatch.
AUTO 100 Mbps, Half-duplex 100 Mbps, Half-duplex 100 Mbps, Half-duplex Link is established, but NIC does not see any autonegotiation information and defaults to 100 Mbps, half-duplex.
AUTO 10 Mbps, Half-duplex 10 Mbps, Half-duplex 10 Mbps, Half-duplex Link is established, but NIC does not see FLP and defaults to 10 Mbps, half-duplex.
1A duplex mismatch can result in performance issues, intermittent connectivity, and loss of communication. When you troubleshoot NIC issues, verify that the NIC and switch use a valid configuration.

2Some third-party NIC cards can fall back to half-duplex operation mode, even though both the switchport and NIC configuration are manually configured for 100 Mbps, full-duplex. This is because NIC autonegotiation link detection still operates when the NIC is manually configured. This causes duplex inconsistency between the switchport and the NIC. Symptoms include poor port performance and frame check sequence (FCS) errors that increment on the switchport. In order to troubleshoot this issue, try to manually configure the switchport to 100 Mbps, half-duplex. If this action resolves the connectivity problems,?this NIC issue is the possible cause. Try to update to the latest drivers for your NIC, or contact your NIC card vendor for additional support.

Hope can help you! The more information about technical support you can consult with our technician – Bill, and his e-mail address is as below: bill@3anetwork.com



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