LAN, Switching and Routing

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Provide answers to questions in this community that are awaiting a correct answer.

Hi Guy's, So I am trying to understand native Vlans in a particular environment. So lets assume my core and switch have trunks with native vlan 1...
9 hours 36 min ago
Hi All,Had an issue today and needs some assistant.Topology is connected like follows.SWITCH1 -> SWITCH2 -> SWITCH3 -> SWITCH4 gi 1/0/24 -...
9 hours 36 min ago
We have a bunch of Cisco 8861 phones on our 2960x switches and Macro auto processing is setup to put phones in the correct VLAN. the IOS version is...
10 hours 19 min ago
Hello dears, Could I ask you one help, please? The Catalyst 3650 Series Switches support or implement the IEEE 802.3ah protocol? I haven't found...
1 day 2 hours ago
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Module status shows unsupported module when installed in slot 10 of the Catalyst 4510R Switch chassis with Supervisor V
Last Reply 8 years 2 weeks ago.
1159
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0 SunilKhanna
MAC Addresses used by the Cisco 3750
Last Reply 8 years 2 weeks ago.
1966
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0 Oliver Gorwits
SFP
Last Reply 8 years 1 week ago.
4410
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0 ITA Terms
CEF
Last Reply 8 years 1 week ago.
1192
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0 ITA Terms
Error Message received, but is not currently listed in the LAN Switching knowledge base.
Last Reply 8 years 1 week ago.
176
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0 TCC_2
The %SYS-3-PORT_OUT_DISCARD: intermittent port error messages are received in Catalyst 6500 Series Switches that run CatOS software
Last Reply 8 years 3 days ago.
2996
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The WS-X6724-SFP module with DFC3A resets with the "%SYS-DFC7-2-MALLOCFAIL" error message in Cisco Catalyst 6500 switches that run Cisco IOS Software
Last Reply 8 years 3 days ago.
376
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0 TCC_2
How to configure a Voice-over-IP (VoIP) network on the Cisco Catalyst 6500 series switches
Last Reply 8 years 3 days ago.
1103
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0 TCC_2
The MSFC reloads and goes into ROMmon mode after the PFC version detected does not match configured version error appears
Last Reply 8 years 3 days ago.
599
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A Cisco Catalyst 6500 or 6000 series switch running CatOS logs the SYS-3-SYS_LCPERR3 syslog error message
Last Reply 7 years 12 months ago.
336
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0 TCC_2
A Catalyst 6000 family switch with dual MSFCs displays the %IPC-5-NULL: Registering Control Port Id=0x2210003 message approximately every 30 seconds
Last Reply 7 years 12 months ago.
193
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0 TCC_2
Users receive the "%ONLINE-SP-6-DNLDFAIL" error message in the logs of a Catalyst 6500 series switch
Last Reply 7 years 12 months ago.
725
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0 TCC_2
Input errors on the Layer-3 interface of Catalyst 6500 switch running Cisco IOS when connected to the Layer-2 switchport of CatOS switch
Last Reply 7 years 12 months ago.
1443
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Output scrolls by and does not stop when "show" commands are issued
Last Reply 7 years 12 months ago.
17827
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0 TCC_2
Create VLAN In Text Mode
Last Reply 7 years 11 months ago.
795
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0 Justin Reeve
Comparison Cisco Catalyst and Cisco IOS Operating Systems
Last Reply 7 years 11 months ago.
1661
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0 SunilKhanna
Cisco Catalyst 4500 E-Series Switches
Last Reply 7 years 11 months ago.
2107
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0 Roberto Cruz
Cisco Catalyst 2950T 48 SI Switch
Last Reply 7 years 11 months ago.
1489
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0 Ashley Price
How NetFlow works when only one of the two supervisors has a NetFlow Services Card (WS-F4531) in Cisco Catalyst 4500/4000 running Cisco IOS
Last Reply 7 years 11 months ago.
785
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0 TCC_2
Configuring EtherChannel results in ports being errdisabled, and fails to form channels due to spanning tree loops caused by VLAN misconfiguration
Last Reply 7 years 11 months ago.
441
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0 TCC_2
User receives the "%SYS-5-SYS_LCPERR5:Coil Pinnacle Header Checksum" error message on a 6248 or 6348 line card installed in a Catalyst 6000 Series platform due to either a hardware or software issue
Last Reply 7 years 11 months ago.
1028
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High CPU utilization on a Catalyst 4500 when connected to an IP phone that uses trunk ports
Last Reply 7 years 11 months ago.
623
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How to keep a VLAN in an "UP/UP" state with no clients or hosts connected in that VLAN
Last Reply 7 years 11 months ago.
2058
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0 TCC_2
A Catalyst 6500 or 7600 switch with Sup720 that runs native Cisco IOS can reload with a breakpoint exception (signal=5)
Last Reply 7 years 11 months ago.
1221
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Supervisor 720 based Catalyst 6500 and 7600 Series Switches running Cisco IOS display the "SP: Linecard endpoint of Channel [dec] lost Sync. to Lower fabric and trying to recover now" error message
Last Reply 7 years 11 months ago.
1627
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