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.

 

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Greetings, One of our 4510 switches that had a single active power supply went down early in the morning.  There is no crashfile on this.  I am tr...
22 min 51 sec ago
Hello Guys, I have a Cisco 6503, there are 16 ports on module 3 and they've been set as trunk ports for Layer 2 switches' uplinks for quite long t...
25 min 5 sec ago
Hi supportforums, I have a cisco 887 configured with trusted VLAN11 and untrusted VLAN33. Wired and wireless clients in VLAN11 get routed via the...
6 hours 37 min ago
Hello,  I have a small LAN, based on SG300-52MP 52-Port L3 switch. On this switch I have 3 VLAN (10, 20, 100) and TWO aDSL routers. At current conf...
10 hours 29 min ago
Hi, I have two C9332PQ switches with initial configuration and we need config the breakout mode at some interfaces. When we write the interface br...
10 hours 39 min ago
         
IP SLA 325 3 0 0 0
Routers 2 0 0 0 0
Switches 6726 569 6 1 0
Filter Results
Subject Views Votes Rating Replies Last replied by
discussion %SPANTREE-2-LOOPGUARD_UNBLOCK: Loop guard unblocking port =========== what could be the reason???
Last Reply 29 min 8 sec ago.
11 0 0 2 Rolf Fischer
discussion Cisco WS-C6509-E Rommon Mode
Last Reply 50 min 56 sec ago.
6 0 0 2 Md.Mahmudul Hasan
discussion cisco router 2800
Last Reply 1 hour 5 min ago.
3 0 0 1 Peter Paluch
discussion Nexus 7000 v6.2(10) - OpenSSH MaxAuthTries Limit Bypass Vulnerability
Last Reply 1 hour 22 min ago.
95 1 5 3 mohdtaamneh
discussion QoS
Last Reply 4 hours 46 min ago.
24 0 0 6 Philip D'Ath
discussion 2960X Stacking
Last Reply 5 hours 16 min ago.
18 0 0 4 Leo Laohoo
discussion Cisco Supported MEdia Convertors
Last Reply 5 hours 46 min ago.
2 0 0 0 rajesh_raj414
discussion errdisable recovery
Last Reply 6 hours 19 min ago.
20 0 0 4 Reza Sharifi
discussion VTP Msgs between 2 switches, via a Router
Last Reply 6 hours 21 min ago.
7 0 0 1 Reza Sharifi
discussion 6500 VSS Switch priority
Last Reply 6 hours 40 min ago.
15 0 5 2 Leo Laohoo
discussion UDLD COnfiguration for 6500 and 3650
Last Reply 6 hours 44 min ago.
10 0 0 1 Leo Laohoo
discussion HSRP setup not available on WS-C3850-24P switch
Last Reply 9 hours 41 min ago.
18 0 0 5 Reza Sharifi
discussion CTS & Spanning Tree
Last Reply 9 hours 51 min ago.
18 0 0 3 Reza Sharifi
discussion VPC(Core) and VSS(Distribution) Interoperability
Last Reply 11 hours 29 min ago.
88 0 0 4 agapitca19
discussion LAN Crashes
Last Reply 15 hours 29 min ago.
17 0 0 2 the.matrix.revo...
discussion What is Difference b/w dot1x authentication & MAB authentication ?
Last Reply 18 hours 48 min ago.
9 0 0 0 Murali Dharan
discussion 6500 SUP720 upgrade problem
Last Reply 18 hours 58 min ago.
73 0 0 10 Madhukrishnan G...
discussion IOS update error
Last Reply 19 hours 3 min ago.
21 0 0 4 Madhukrishnan G...
discussion 802.1t
Last Reply 19 hours 11 min ago.
1545 0 5 8 Peter Paluch
discussion WS-CBS3020-HPQ Ping lose
Last Reply 19 hours 12 min ago.
15 0 0 3 Madhukrishnan G...
discussion Cisco Supported Media Convertors
Last Reply 19 hours 19 min ago.
8 0 0 1 Reza Sharifi
discussion SUP720 back to RP rommon mode after booting completely
Last Reply 19 hours 23 min ago.
41 0 5 5 Hele Du
discussion Blocked Stack Ports on 2960X-48FPD-L Stack (Unstable Switch Stack!) Spanning Tree?
Last Reply 19 hours 35 min ago.
431 0 0 11 andreabat72
discussion Cisco ME3600 Policer
Last Reply 19 hours 55 min ago.
6 0 0 0 Bayoan Alvarado
discussion why we need IPv6 solicited multicast address ??
Last Reply 22 hours 24 min ago.
72 0 5 6 Peter Paluch
Filter Results
Subject Views Rating Comments Author
Потенциальная проблема OSPF NSF и Multi-chassis HA
Last Reply 21 hours 4 min ago.
2
0.0
0 Vasilii Mikhailovskii
How to use Time-Domain Reflectometer (TDR)
Last Reply 1 day 9 hours ago.
91126
5.0
84 Leo Laohoo
Understanding MSFC, PFC and DFC roles in Catalyst 6500 Series Switch
Last Reply 3 days 7 hours ago.
56672
5.0
14 SunilKhanna
Understanding Ethernet Virtual Circuits (EVC)
Last Reply 4 days 15 hours ago.
307387
5.0
43 plumbis
3850 switch - IOS XE upgrade Detailed (standalone)
Last Reply 1 week 1 day ago.
10753
5.0
7 Furose Khan Mohammed Ali
IPV6 on the Cisco 877
Last Reply 1 week 5 days ago.
34765
5.0
0 Andrew Judson
QUICK TIPS: Installing Multiple Cisco Switches - Video
Last Reply 2 weeks 6 days ago.
5
0.0
0 tfortunato
Error Message:%ILPOWER-3-CONTROLLER_PORT_ERR: Controller port error, Interface <interface> Power Controller reports power Imax error detected
Last Reply 3 weeks 4 days ago.
15591
5.0
5 Sivagami Narayanan
DHCP Static Binding on Cisco IOS
Last Reply 4 weeks 1 day ago.
23
0.0
0 indrapalccna
Virtual switching system (VSS) Configuration For Cisco 4500 series switches
Last Reply 4 weeks 1 day ago.
50296
4.7
60 ashirkar
OSPF and IS-IS Differences
Last Reply 1 month 1 week ago.
6982
5.0
3 inderdeeps
34 Things about OSPF
Last Reply 1 month 1 week ago.
36
0.0
0 inderdeeps
Nexus - vPC Recommendations
Last Reply 1 month 1 week ago.
25573
5.0
4 pnagpal
The Cisco Discovery Protocol displays the "%CDP-4-DUPLEX_MISMATCH" error message on Catalyst fixed configuration switches running IOS software.
Last Reply 1 month 3 weeks ago.
19398
5.0
1 TCC_2
The "%Error formatting slot0 (Can not find flash algorithm)" error message is displayed during an attempt to format the ATA flash card in Cisco Catalyst 6000/6500 series switches
Last Reply 1 month 3 weeks ago.
2552
5.0
1 TCC_2
4500X-32 IOS upgrade procedure
Last Reply 1 month 3 weeks ago.
35
0.0
0 butturwa
How to Form a Catalyst 3850 Data-Stack and Power-Stack
Last Reply 2 months 1 week ago.
1113
5.0
2 Luis Villanueva Brito
How to configure Ether Switch Modules connected to a router
Last Reply 2 months 1 week ago.
2497
0.0
2 TCC_2
What is the difference between an IP base image and an IP services image
Last Reply 2 months 2 weeks ago.
202920
5.0
10 tahirshabbir
How to configure a Cisco Catalyst Express 500 series switch
Last Reply 2 months 4 weeks ago.
18427
5.0
3 TCC_2
Routing Protocol Selection Guide - IGRP, EIGRP, OSPF, IS-IS, BGP
Last Reply 3 months 1 week ago.
154761
4.0
2 Shaun Hummel
3850: Understanding interface configuration on NM modules
Last Reply 3 months 2 weeks ago.
33827
5.0
12 Richard Primm
I am receiving some error like broadcast and input error please see detail, Is it normal ?
Last Reply 4 months 2 days ago.
51
0.0
1 junaidmumtazcisco
SSH version 2 no IOS cat4000-i5s-mz.122-25.EWA14.bin
Last Reply 4 months 2 weeks ago.
54
0.0
2 Sergio Alvares
SSH/Telnet not happening to Catalyst 6K due to SSH RSA_Sign:Private key not found.
Last Reply 4 months 3 weeks ago.
51
5.0
0 InayathUlla Sharieff
Filter Results
Subject Views Rating Comments Author
blog Loading an IOS on a switch via Xmodem
Last Reply 3 weeks 2 days ago.
65730
5.0
11 Aninda Chatterjee
blog How do etherchannel HASH algorithm works and LOAD DISTRIBUTION happen?
Last Reply 2 months 21 hours ago.
25010
4.7
13 Akula Jyoti Lakshmi
blog Collector Security
Last Reply 2 months 3 weeks ago.
18
0.0
0 marobbs
blog Who Should Attend The Kickoff Meeting?
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42
0.0
0 marobbs
blog Network Optimization: The 90-Day Plan
Last Reply 3 months 1 week ago.
52
0.0
0 marobbs
blog Prepare for the Collector
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33
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0 marobbs
blog Expert Insights: Network Optimization
Last Reply 3 months 4 weeks ago.
55
0.0
0 marobbs
blog Network Compliance Analysis
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42
0.0
0 marobbs
blog Three Tips for a Successful Review Period
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44
0.0
0 marobbs
blog Nexus 7000 ACL logging (OAL)
Last Reply 4 months 3 days ago.
18615
5.0
8 Robert Taylor
blog Active /Active Internet Load balancing with High availability ( AS Prepend Path)
Last Reply 4 months 1 week ago.
213
5.0
0 Ganesh Hariharan
blog Output drops due to QoS on 2960/3560/3750 switches
Last Reply 7 months 1 week ago.
28534
5.0
1 Shashank Singh
blog License Activation on 4500
Last Reply 1 year 3 months ago.
773
0.0
1 sheraz butt
blog Nexus 7000 and IOS OSPF Loop Prevention and Interoperability
Last Reply 1 year 3 months ago.
7683
5.0
7 Robert Taylor
blog How to build the topology of an OSPF area
Last Reply 1 year 6 months ago.
2913
5.0
5 Aninda Chatterjee
blog Booting Cisco Router from a TFTP server
Last Reply 1 year 6 months ago.
22242
5.0
3 ajaju
blog Configuring a frame-relay switch
Last Reply 1 year 8 months ago.
7826
5.0
7 Aninda Chatterjee
blog Upcoming Ask the Expert Event Featuring Ahmad Manzoor - Senior Pre-Sales Engineer at AGCN
Last Reply 1 year 9 months ago.
386
5.0
0 Francine Richards
blog Upcoming Ask the Expert Event with Cisco Designated VIP Marwan Al-shawi May 12-23
Last Reply 1 year 9 months ago.
139
0.0
0 Francine Richards
blog Cisco WCCP with Bluecoat (Multicast mode)
Last Reply 1 year 9 months ago.
137
0.0
0 vishal_2007
blog OSPF over IPsec Tunnel stucks in INIT state
Last Reply 1 year 9 months ago.
489
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0 hsticher
blog Pre-build SPT feature on Nexus - Benefits & Caveats
Last Reply 1 year 10 months ago.
1555
5.0
0 srereddy
blog Link de-bounce timer operation when used on SFP+ ports on Nexus switches
Last Reply 1 year 10 months ago.
778
5.0
2 srereddy
blog Flexlink in Cisco Layer 2 network
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181
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0 Akula Jyoti Lakshmi
blog Community Tech-Talk Series: Troubleshooting High CPU due to Multicast
Last Reply 1 year 10 months ago.
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9 Ruchir Jain
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