5 votes
Accepted

Unable to disable CRC check on Cisco 2960-X

The giveaway is the port name Gi1/0/50. An SFP+ DAC generally requires an SFP+ (10G) port. There are very few SFP ports (1G) that accept SFP+ modules. There are no SFP DACs, so you could use either a ...
Zac67's user avatar
  • 83.9k
4 votes
Accepted

Disable empty power slot on Cisco 2960xr

I suspect that this log message is not caused by the absence of the PSU but by an IOS bug (e.g. CSCuv53498 but there are more), so upgrading it may get rid of the messages. Alternatively, configure ...
hertitu's user avatar
  • 2,638
4 votes
Accepted

QoS on 2960X does not seem to have an impact

As already commented, QoS can only shape your traffic in case of congestion - it can prioritize some traffic before other but it can't make your network faster. The only way to reduce idle latency is ...
Zac67's user avatar
  • 83.9k
4 votes
Accepted

Updating config on 2960s Stack by copying from FTP

If you are reloading, you want to replace the startup configuration, not the running configuration. Otherwise, the device will start up with the old startup configuration, which is stored on nvram:. ...
Ron Maupin's user avatar
  • 99.4k
3 votes

How to create/delete multiple VLANs in a single command?

I use the below all the time on Cisco Catalyst switches: ! conf t ! vlan 2-10 ! no vlan 2-10 ! vlan 2,3,4,5,6,7 ! no vlan 2,3,4,5,6,7 !
Yosef Gunsburg's user avatar
2 votes

How do I diagnose a VoIP issue on a Cisco 2811?

for me it sounds like problem in CALL HUNTING configuration you have two ephone-dn 's (4 & 22) with 2000 extension ,which will handle the incommoding calls, where 4 with preference 0 and 22 with ...
Gadeliow's user avatar
  • 3,444
2 votes
Accepted

Can't use "dot1x" command in Cisco Packet Tracer

Packet tracer does not use real IOS but emulate devices with an IOS-like environment. This software is really made by Cisco for entree-level Cisco courses, so it includes what is relevant to those ...
JFL's user avatar
  • 19.6k
2 votes

Need clarification on some Cisco configurations

There's no such thing as "switchport mode acces vlan 1, 2, 3" A switchport in access mode will be associated with a unique VLAN and the packet leaving the port will be untagged. (Well, if you use a ...
JFL's user avatar
  • 19.6k
2 votes
Accepted

cisco switch iOS running into problem

It seems like some other people also had the same issue, for some people, hard resetting the device worked fine. You can find the thread here Hope it helps
naïveRSA's user avatar
  • 760
2 votes
Accepted

Cisco 2960x: Adding a new cable to complete the "ring" with switches powered on - is it safe?

Since the switches are all already members of the same stack, it is nearly foolproof. If you were adding a new member to the stack you'd want to make sure the new member didn't become master. Since ...
Jeff Wheeler's user avatar
  • 5,449
2 votes
Accepted

Is it possible to enable jumbo frame only on some interfaces of CISCO WS-C2960X-24PS-L

No, it is not possible to change the MTU for a single interface, nor is it possible to change the MTU without a reload on your switch platform. The documentation you provided explicitly confirms ...
TDurden's user avatar
  • 1,241
2 votes

Force Catalyst 2960X Boot Loader upgrade to the same version

What issue(s) are you trying to fix? Bootloader and "BOOTROM" (aka. ROMMON) are different things. (basically, the difference between GRUB and BIOS on a PC.) I don't see an updated ROMMON ...
Ricky's user avatar
  • 32.1k
2 votes

Cisco 2960-X IOS Version 15.2 can't use command access-session control-direction both

If not configured for 802.1X, a switch does not need any special configuration to support WoL. That is, unless it's being used as a L3 switch and is acting as default gateway into/for the given VLAN/...
Marc 'netztier' Luethi's user avatar
1 vote
Accepted

C2960 %LINEPROTO-5 UPDOWN and %LINK-3-UPDOWN when speed is not set on 100

The speed 100 line configures the interface down to 100BASE-TX. If that works correctly and 1000BASE-T doesn't (the default, fully autonegotiated mode), the likely cause is a cable fault. 100BASE-TX ...
Zac67's user avatar
  • 83.9k
1 vote
Accepted

Cisco 2960x Stack IOS version mismatch

I was finally able to test it in the production environment at my company and can confirm that no USB was necessary, despite the "Major Stack Protocol Version Number Incompatibility" - it ...
Martin Ledermann's user avatar
1 vote

Cisco 2960x Stack IOS version mismatch

Major Stack Protocol Version Number Incompatibility Among Stack-Capable Switches Switches with different major Cisco IOS software versions usually have different stack protocol versions. Switches with ...
Ricky's user avatar
  • 32.1k
1 vote

Unable to use a specific IP for an IP Camera attached to a Cisco 2960 static access port

To find a duplicate IP address: Run a packet capture (possibly filtered by arp). Ping the address to prompt an ARP request. Ignore the actual ping reply. Both devices should reply to the ARP request. ...
Zac67's user avatar
  • 83.9k
1 vote

How can I ping from the cisco switch to host on one vlan but not another vlan?

A missing default gateway on an IP endpoint can cause this. Also, the source address of the ping can cause this. If you just type ping and press enter you'll get options including the ability to ...
Ronnie Royston's user avatar
1 vote

Disable DHCP on a 2960x?

You can disable DHCP service on Cisco device by entering this in confuguration mode: (conf-t)# no service dhcp
Andrey Prokhorov's user avatar
1 vote

Disable DHCP on a 2960x?

As with most Cisco commands, you can use the no form of the command to remove it. For example, no ip dhcp pool <name>. You may need to set up IP helpers (DHCP relay) on some VLANs if your new ...
Ron Maupin's user avatar
  • 99.4k
1 vote

Is it possible to enable jumbo frame only on some interfaces of CISCO WS-C2960X-24PS-L

Sorry to be the bearer of bad news, but as far as I am aware, setting individual MTU per port isn't supported on the 2960 platform. Your only choice here is a reboot of the switch setting the MTU ...
John Ellis's user avatar
1 vote
Accepted

Cisco 2960 Portfast ports generate Spanning Tree TCN

Although this question is rather old, someone may find it while googling the very same problem, so here comes our "solution": We couldn't figure out the source of the problem, as the problem was non-...
xpac's user avatar
  • 440

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