LAN, Switching and Routing

The Cisco LAN, Routing and Switching Technical Support Forum gives you access to participate in tech discussions and go through documents on Cisco LAN Switch, LAN Router, VLAN, Cisco Catalyst, Catalyst 6500, Catalyst 3550, Jabber Client, Nexus 7000, and other related issues. You can browse through latest tech topics popular among the community.

 

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

I was tasked with updating the software on a 6807 with a single sup2t module. This was not a production switch and I did not have any ethernet port...
3 min 15 sec ago
Hello Networkers!I would like to know how a switch handles marking of non-IP frames when 'mls qos trust dscp' is set on a trunk port.DSCP is contai...
42 min 32 sec ago
Hi all,   I came across this term and swear i did see something similar in one my lab routing table. But I just cant figure out how this type of ro...
2 hours 4 min ago
Having an issue where wireless clients frequently lose internet connectivity.  Clients do not lose wireless connection & LAN access is unaffect...
3 hours 9 min ago
Hello guys, I can't upload any other file in my cme and I don't know why. And I see something wrong like that "% ?+* follows nothing%" in my CME.I...
3 hours 32 min ago
         
IP SLA 325 3 0 0 0
Routers 2 0 0 0 0
Switches 6735 569 6 1 0
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discussion simple binary question to double confirm.
Last Reply 1 month 1 week ago.
14 0 0.0 1 KOH SZE JIE
discussion C2960-24PC-L & profinet device
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17 0 0.0 1 markmalone2008
discussion process = SNMP ENGINE
Last Reply 1 month 5 days ago.
3 0 0.0 0 MOHAMMED-AMINE ...
discussion Managed switch selection for multiple small retail sites
Last Reply 1 month 4 days ago.
24 0 3.5 6 mitchen
discussion 3850's and 10G line cards
Last Reply 1 month 4 days ago.
11 0 0.0 3 Reza Sharifi
discussion why is the router sending reverse DNS queries ?
Last Reply 1 month 1 day ago.
0 0 0.0 0 KOH SZE JIE
discussion Connecting Cisco 2600 Router to home ISP Cable Modem
Last Reply 1 month 1 day ago.
4 0 0.0 3 Jason Bassett
discussion TrustSec on 3560CG switch
Last Reply 1 month 1 day ago.
1 0 0.0 0 danny4569
discussion 6509 Healthy Temperature - 'chassis-2 Chassis Fan Tray 1 on 6509-quays is Critical'
Last Reply 1 month 1 day ago.
4 0 0.0 0 m.s.rees1
discussion How to control multicast within one same Lan ?
Last Reply 1 month 1 day ago.
66 0 0.0 9 Jon Marshall
discussion C6509-E WS-SUP720-3BXL to VS-S2T-10G Supervisor Upgrade Path
Last Reply 1 month 1 day ago.
5 0 0.0 1 Reza Sharifi
discussion cisco show logs - view history logs ?
Last Reply 1 month 1 day ago.
1 0 0.0 0 KOH SZE JIE
discussion Level 15 console login with tacacs server on Cisco 2960
Last Reply 1 month 1 day ago.
14 0 5 2 nmdmoreira
discussion OSPF Routing / Multicast / vPC / Peer-Link / Nexus 56128
Last Reply 1 month 1 day ago.
111 0 0.0 1 Vasilii Mikhail...
discussion IP address restructuring
Last Reply 1 month 6 days ago.
32 0 5 3 Vishnu Reddy
discussion cisco show logs - view history logs
Last Reply 1 month 1 day ago.
2 0 0.0 0 KOH SZE JIE
discussion ping no response found - what does it meant?
Last Reply 1 month 1 day ago.
22 0 0.0 1 KOH SZE JIE
discussion SG300-10 Sanitization Procedure
Last Reply 1 month 1 day ago.
0 0 0.0 0 michael-foley
discussion MAC address flapping in and out of MAC table on 3750X stack
Last Reply 1 month 1 day ago.
31 0 0.0 7 branfarm1
discussion Cisco 4321 - ISR4321-SEC/K9 - Web Gui
Last Reply 1 month 1 day ago.
1 0 0.0 0 ciscojoe837
discussion pinging to remote broadcast address - cant understand the response.
Last Reply 1 month 22 hours ago.
6 0 0.0 1 Leo Laohoo
discussion 192.168.1.0/21 ???!!
Last Reply 1 month 22 hours ago.
35 0 0.0 12 jo-ker2001
discussion NAT + VPN help needed
Last Reply 1 month 10 hours ago.
60 0 5 16 nocsertech
discussion Cisco 3650 RJ-45 Console Port Unavailable
Last Reply 1 month 6 hours ago.
10 0 5 3 nick-tompkins
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Add port To Vlan
Last Reply 5 years 11 months ago.
57457
5.0
0 ITA Terms
Module status shows unsupported module when installed in slot 10 of the Catalyst 4510R Switch chassis with Supervisor V
Last Reply 5 years 11 months ago.
1058
0.0
0 SunilKhanna
MAC Addresses used by the Cisco 3750
Last Reply 5 years 11 months ago.
1506
0.0
0 Oliver Gorwits
SFP
Last Reply 5 years 11 months ago.
3868
0.0
0 ITA Terms
CEF
Last Reply 5 years 11 months ago.
1151
0.0
0 ITA Terms
Error Message received, but is not currently listed in the LAN Switching knowledge base.
Last Reply 5 years 11 months ago.
175
0.0
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 5 years 11 months ago.
2819
0.0
0 TCC_2
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 5 years 11 months ago.
356
0.0
0 TCC_2
How to configure a Voice-over-IP (VoIP) network on the Cisco Catalyst 6500 series switches
Last Reply 5 years 11 months ago.
1071
0.0
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 5 years 11 months ago.
483
0.0
0 TCC_2
A Cisco Catalyst 6500 or 6000 series switch running CatOS logs the SYS-3-SYS_LCPERR3 syslog error message
Last Reply 5 years 11 months ago.
334
0.0
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 5 years 11 months ago.
185
0.0
0 TCC_2
Users receive the "%ONLINE-SP-6-DNLDFAIL" error message in the logs of a Catalyst 6500 series switch
Last Reply 5 years 11 months ago.
684
0.0
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 5 years 11 months ago.
1349
0.0
0 TCC_2
Output scrolls by and does not stop when "show" commands are issued
Last Reply 5 years 11 months ago.
10489
5.0
0 TCC_2
Create VLAN In Text Mode
Last Reply 5 years 11 months ago.
763
0.0
0 Justin Reeve
Comparison Cisco Catalyst and Cisco IOS Operating Systems
Last Reply 5 years 11 months ago.
1656
0.0
0 SunilKhanna
Cisco Catalyst 4500 E-Series Switches
Last Reply 5 years 11 months ago.
2087
0.0
0 Roberto Cruz
Cisco Catalyst 2950T 48 SI Switch
Last Reply 5 years 11 months ago.
1434
0.0
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 5 years 11 months ago.
780
0.0
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 5 years 11 months ago.
431
0.0
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 5 years 11 months ago.
977
0.0
0 TCC_2
High CPU utilization on a Catalyst 4500 when connected to an IP phone that uses trunk ports
Last Reply 5 years 11 months ago.
613
0.0
0 TCC_2
How to keep a VLAN in an "UP/UP" state with no clients or hosts connected in that VLAN
Last Reply 5 years 11 months ago.
1894
0.0
0 TCC_2
Unable to Telnet to other devices, and the %telnet connections not permitted from this terminal error message is received when an attempt is made to session to other modules
Last Reply 5 years 11 months ago.
8798
5.0
0 TCC_2
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blog MPLS Conference 2010 and Cisco Leadership
Last Reply 4 years 6 months ago.
3109
0.0
0 mmorrow
blog From Internet of Things to Web of Things
Last Reply 4 years 4 months ago.
2546
0.0
0 mmorrow
blog FabricPath: Cisco’s New Technology of Extending Layer 2 Network Without Spanning Tree
Last Reply 4 years 4 months ago.
3187
0.0
0 TS-newsletter
blog Cloud Computing: Update ITU-T Focus Group and OMG-Hosted Telecom Cloud Conference
Last Reply 4 years 3 months ago.
1555
0.0
2 mmorrow
blog The best CCO document link for Peer-Gateway on vPC/Nexus7000
Last Reply 4 years 2 months ago.
4535
5.0
0 kyukim
blog Converting IOS to CatOS in Production Switch
Last Reply 3 years 10 months ago.
2427
3.0
6 Tripat Singh
blog Machine-to-Machine Communications as a Subset of Internet of Things
Last Reply 3 years 9 months ago.
2105
0.0
0 mmorrow
blog Troubleshoot L2 Connectivity Issue : VTP PRUNING
Last Reply 3 years 6 months ago.
7033
5.0
3 rparames
blog Upcoming Webcast: Troubleshooting Tools to Analyze High CPU Utilization Issues on Cisco Catalyst 6500 Series Switches
Last Reply 3 years 4 months ago.
1656
0.0
0 ciscomoderator
blog Troubleshooting L2 issues - ARP Poisoning
Last Reply 3 years 4 months ago.
6908
0.0
4 rparames
blog Moving Beyond the Internet of Things in 2012
Last Reply 3 years 4 months ago.
1711
5.0
0 mmorrow
blog New Cisco 5915 ESR
Last Reply 3 years 1 week ago.
4223
5.0
2 Sonal Singh
blog Important Nexus 7000 NX-OS Software Update
Last Reply 2 years 12 months ago.
4089
5.0
0 ctripoli
blog Leak Map - Eigrp, Some leaks are useful..
Last Reply 2 years 10 months ago.
10458
5.0
7 pnagpal
blog Router Crashes
Last Reply 2 years 7 months ago.
5822
5.0
1 ajaju
blog Multicast for the heart Part I: IGMP
Last Reply 2 years 6 months ago.
4236
4.8
1 Aninda Chatterjee
blog Nexus 7000 ACL logging (OAL)
Last Reply 1 year 10 months ago.
15705
5.0
7 Robert Taylor
blog Parity Error.
Last Reply 1 year 10 months ago.
2294
4.5
4 InayathUlla Sharieff
blog About "TestErrorCounterMonitor" in 6500/7600
Last Reply 1 year 9 months ago.
1859
4.7
1 Anand G
blog Difference between N7K-M132XP -12 and N7K-M132XP -12L
Last Reply 1 year 5 months ago.
1627
0.0
1 ramugaju
blog Switch: How to test a cable status?
Last Reply 1 year 2 months ago.
5448
5.0
3 Anand G
blog Chalk Talk: The Secret to Successful QoS Deployments: A Well-Defined End-to-End QoS Strate
Last Reply 1 year 2 months ago.
276
0.0
0 Julie Burruss
blog Community Tech-Talk Series: Troubleshooting High CPU due to Multicast
Last Reply 2 years 2 weeks ago.
7925
5.0
9 rucjain
blog Output drops due to QoS on 2960/3560/3750 switches
Last Reply 4 years 1 month ago.
24555
5.0
0 Shashank Singh
blog Flexlink in Cisco Layer 2 network
Last Reply 2 years 3 months ago.
94
5.0
0 jakula
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