Latest questions from the community.
The poster wanted to use third-party SFP modules in a Cisco Catalyst 2960L-48TS (LAN Lite feature set, image c2960l-universalk9-mz.152-6.E2b). Entering 'service unsupported-transceiver' in global configuration mode only produced a command error because the CLI does not know the command on this…
The poster runs a Cisco Nexus 5000 with an N2K-C2232PP-10GE fabric extender. Three FEX-facing ports report 'sfp validation failed' with Cisco FET-10G modules. Following advice found online, the module was removed, the port speed set to 1000 and the module reinserted; the port was also shut/no shut…
While building a trunk between a Cisco Catalyst 3650-48PS and a Catalyst 3560CX-12PC using Cisco GLC-T copper SFPs at both ends, the 3560CX logged '%PHY-4-SFPNOTSUPPORTED: The SFP in Gi0/11 is not supported' and the link would not come up. The poster had already tried 'no errdisable detect cause…
The poster has a stack of two Cisco Catalyst 3850-48T switches, each fitted with a 2x1G/2x10G fiber uplink network module. Two 10G fiber links already run in slots 2/1/3 and 2/1/4. When a single-mode 1G SFP is inserted into 1G slot 2/1/1, the switch reports the module as unsupported and places the…
Two Cisco Catalyst C1200-48T-4X switches were connected back-to-back with Cisco SFP-10G-LR modules in the ge49/te1 SFP+ slots. Both switches recognize the transceivers, the interfaces are administratively up, both ends transmit light and the DOM optical values are good, yet no link is established…
The poster set up several new Cisco Catalyst 9300 switches fitted with C9300-NM-4G network modules, configured GigabitEthernet1/1/1 as a trunk and enabled it, but could not get a link with any of several SFPs. 'show interfaces' reports 'GigabitEthernet1/1/1 is down, line protocol is down…