Cisco Switching/Routing :: 1941 - Use One Ethernet Port (G0/0) As Primary And Other (G0/1) As Backup Interface

Jan 20, 2013

Here's my problem.  I'm going to be using Cisco 1941 routers at a bunch of remote sites.  All of these sites have 2 comm paths out.  Some of them have 2 IP/VHF radios and some have 1 IP/VHF radio and a copper link using Patton ethernet extenders.  From the VHF radios the data hit our MPLS network back to our HQ and the sites with copper go directly back to our HQ.  Everything ends up at a Cisco 4948 switch. The problem I'm having is that I want the routers at the remote site to use one ethernet port (G0/0) as the primary and the other (G0/1) as the backup interface.  I've tried the backup interface command but the problem is that depending on where an outage occurs the ethernet link to either the radio or Patton stays up so it never switches over. We're using OSPF as our routing protocol and I'm sure there's something that can be done with it but I'm not sure what. 

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Cisco Switching/Routing :: 2951 - HSRP Backup Taking Two Minutes When Switching Off Primary Router

Oct 7, 2012

I configure HSRP on Router 2951 as a primary router, and Router 2811 as backup router. But when I am switching off my Primary router the backup router is  taking 2 mins to take over form primary router. 

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Cisco Switching/Routing :: 1941 Ethernet Load Balance?

Mar 5, 2013

I'm setting up a lot of small remote sites that are only reachable via VHF ethernet radios that operate at 32k.  I'm going to be using 2 of these radios shooting to two seperate base station radios to provide diversity.  I'm going to have a Cisco 1941 sitting between the two radios and the way I have it configured now is to only use one radio and the second is only sitting there in case the primary fails.  I was thinking though that I could load balance them to give a little more throughput.  The devices at these sites are really low speed but we like to use snmp to monitor everything that is ethernet so I wanted to give as much bandwidth as I can. 
Will load balancing work in this situation?  What would the basic configuration be?  This is all internal to our network so there are no ISPs to deal with.  We're using C1900-UNIVERSALK9-M IOS will that work or will I need to change that?

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Cisco Switching/Routing :: 1941 Router Interface Binding

May 16, 2012

Router 1941 is installed with additional 4 Gig-interfaces card; we have 4 ADSL Router with 4 MB connections. I need to connect all the ADSL connection to the router 4 port and combine them into 16 MB, is there any way to combine 4 Gig interfaces?

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Cisco Switching/Routing :: 891 Using V.92 Port For Backup?

Mar 14, 2012

My company uses Cisco 891's in replacement of the 1811 where we would have DBU used via an external modem and a triggered time of 3 minutes after a primary connection failure was identified.  In testing the 891 in a Layer 2 failure environment, it is within milliseconds that the v.92 port is engaging after the layer 2 failure.  Has anyone been able to get it to attempt at a more than millisecond rate? 
Redacted config from router:
ip sla 1
icmp-echo <%= probeIP1 %> source-interface GigabitEthernet0


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Cisco Switching/Routing :: Convert 1941 Router To POE With 4 Port Switch

Dec 20, 2011

I have a Cisco 1941 K9 Router.  I want to add POE functionaltiy to it.  Specifically I want a 4 port EHWIC POE switch to power a couple of AP's.
This is what I understand I need; Upgrade/replace the internal power supply with PWR-1941-POE power supply,  This is supplied with a fan replacement also (not yet purchased).buy 1 x EHWIC-4ESG (4 port switch)buy 1 x ILPM-4 (inline daughter card / power supply board) I think the real question here is the 4 port switch... there are two types available one is EHWIC-4ESG=the other is EHWIC-4ESG-P= 

Is there any difference between these two switch modules? or are they the same and the more expensive "P" version is simply supplied with the ILPM-4 daughter card for POE?
I have recieved via courier today 1 x EHWIC-4ESG, and found a ILPM-4 on ebay for a good price.  WIll this provide POE through the switch EHWIC-4ESG?

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Cisco Switching/Routing :: 1941 Router GE0/1 Port Burnt And Need To Configure

Aug 29, 2012

I Have a Cisco 1941 router which had its GE0/1 port burnt out and we have since plugged in a module with 4 fast ethernet ports. I need to reconfigure the router such that at least one of the Fast ethernet ports can server the purpose of the GE0/1. GE0/0 connects to our Service provider and GE0/1 connected to the inside network.Currently, while connected to one of the ethernet ports, i can telnet into the router on the address when i'm on the router, i can ping our remote site, network address with no problem, but when i use the command "Ping source" there is no response.

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Cisco Switching/Routing :: 1941 Upgrade With 4 Port POE Switch Requirements?

Dec 5, 2011

I have a cisco 1941 router.  Stock standard vanilla hardware, no extras.  Standard universal image.  Data and Security not enabled.I would like to add a 4 gigabit port POE switch (EHWIC) module to the router..The 4 port POE switch module will be used to power and connect 2 x Areonet AP's for my home.  I'm replacing a Apple Airport Extreeme and Express setup.  I'll possibly later use the two remaining POE ports for security cameras.My question is, what extra hardware and or IOS version do I need for the POE swtich module to function on the 1941?  [URL] I think this is the model I want EHWIC-4ESG-P #4 port 10/100/1000 Enhanced High-Speed WAN Interface Gigabit Ethernet switch with Power over Ethernet?

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Cisco Switching/Routing :: 4 And 8 Port Switch Module In 1941 Router

May 23, 2013

My questions is can a 4 port PoE switch module (EHWIC-4ESG-P) and a 8 port switch module (EHWIC-D-8ESG) be used at the same time in a Cisco 1941 router?

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Cisco Switching/Routing :: Additional RJ45 Port Required On 1941 ISR

Nov 16, 2012

One of branch locations has a Cisco 1941 Router . The port details are as follows
-Gi0/0 - ISP line
-Gi0/1 - Inside Network ( To a 2960 Switch)
Now they have procurred another line from ISP through which  MPLS based VPN to the Main location is configured. What are the options I have , to terminate it on the Router ? As all the On board LAN ports are filled I guess I wont be able to do anything with the current setup .Are Switching modules available ? What is the Embedded-Service-Engine0/0 port that I see on #sh ip int b output ?

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Cisco Switching/Routing :: 1941 Port-Security With Router Switch Module

Feb 29, 2012

I have a 1941 that I am going to deploy with a HWIC-D-9ESW switch module (I only need 3 switch ports but need the PoE).  I am going to hang a 1262 autonomous AP off one of the ports but I need to configure MAC address port-security so that only that AP can pass traffic. I know the switch modules are 'almost' exactly like a switch for commands but I can't seem to enable or configure any port-security settings.  Is port-security no available on the switch modules?

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Cisco Switching/Routing :: Unable To Login Through Console Port On 1941 Router

Mar 12, 2012

I have a strange issue that I am having an issue figuring out. I am trying to login to the 1941 router through the console port. When I enter the username and password, which I just set, it fails. I am able to login under a different login but when I try to enter the enable mode the enable password doesn't work, which I just set as well. I can login with the TACACS+ login from a SSH session. Here is the line config:
line con 0
exec-timeout 15 0
logging synchronous


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Cisco Wireless :: Backup Port Of WLC 5508 MGMT Interface

Sep 8, 2012

Since WLC5508 MGMT interface is configured a AP-Mgr at the same time, can I set a Backup Port to WLC5508 MGMT interface? Refer to WLC configuration Guide:
In the Backup Port text box, enter the number of the backup port assigned to the management interface. If the primary port for the management interface fails, the interface automatically moves to the backup port.
Note Do not define a backup port for an AP-manager interface. Port redundancy is not supported for AP-manager interfaces. If the AP-manager interface fails, all of the access points connected to the controller through that interface are evenly distributed among the other configured AP-manager interfaces
if I need to configure the backup port for MGMT interface, i need to remove the AP-manager on MGMT interface and create a network dynamic interface for AP-Manager ?

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Cisco Switching/Routing :: Configuring 1941 With 8 Port EHWic Switch Module And Onboard GE Ports In Single LAN?

Jul 1, 2012

Can you configure a Cisco 1941 to use an 8 port EHWic module and the 2 onboard GE ports in a single LAN?

I've discovered you can't have the on GE ports associated with a VLan, and I'm when I've previously researched for a solution, bridging was mentioned but I cannot seem to get it to work (or completely understand it)The reason I would like to use all 10 ports on for the LAN is becuase I have 10 devices I need to connect to the 1941?

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Cisco Switching/Routing :: 4503 - How To Keep Ethernet Interface Up

Jan 18, 2012

There is some way to increase the speed of changing the interface state from DOWN to UP when the cable is connected. I need to configure a port of Cisco 4503 in a way that when a cable is connected the port goes immediatly UP.
A solution can be to keep Cisco interface always UP and I remember that with "no keepalive" command to the interface configuration it was possible. But I tried and nothing happens.

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Cisco Switching / Routing :: 16 / 24 Port Ethernet Card For 2800?

Jan 11, 2012

I am looking a 16 or 24 Port Ethernet (NON POE) card for my 2800 Cisco Router NM-16ESW is EOL/EOS and the replacement is shown as SM-ES2-24 However SM-ES2-24 is not supported on Cisco 2800 Series.

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Cisco Switching/Routing :: WS C2960G LAN Port Speed Interface Is Low

Sep 19, 2012

I am facing port speed issue on WS-C2960G-48TC-L series switch.This switch gig0/X ports connected to onother switches (Cisco and HP both switches are also gigbit ports and directly connected ).but interface is giving only 100mb/s output.ios on WS-C2960G-48TC-L is 12.2(44)SE6

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Cisco Switching/Routing :: Use Sub-interface On Routed Port On 6509

Mar 14, 2012

We are looking for a solution that to use Sub-interface on a routed port on 6509, instead of using a SVI on it.Are there any different when using Sub-interface?

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Cisco Switching/Routing :: 2851 Router Gigabit Ethernet Port

Dec 29, 2012

I have a Cisco 2851 router and need an additional gigabit Ethernet port. How to get the part number I need to order?

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Cisco Switching/Routing :: Default Ethernet Port On Nexus 5548?

Jan 25, 2012

How to remove the config from an ethernet port on a Nexus 5548 - send it back to factory default.

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Cisco Switching/Routing :: C3750 - Ethernet Port Goes To Err Disable Mode

Dec 6, 2011

I have stacked WS-C3750E-24PD with Ten Gigabit Ethernet ports configured under ether-channel. It has c3750e-universalk9-mz.122-55.SE1.bin IOS installed on it. One of the Ten Gigabit Ethernet ports, goes to err-disable mode with following errors on that specific ports.

%SFF8472-5-THRESHOLD_VIOLATION: Te1/0/2: Tx power low alarm; Operating value: -31.0 dBm, Threshold value:  -9.0 dBm.
%SFF8472-5-THRESHOLD_VIOLATION: Te1/0/2: Tx power low alarm; Operating value: -31.0 dBm, Threshold value:  -9.0 dBm. (DROmx-1-1)
I have gone through some of CSC forums like {URL}. The workaround is to "Remove the X2 or SFP from the inactive up link port" which is not in my case.

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Cisco Switching/Routing :: 3560x / Ethernet Trunk Port - What Is Hogging Bandwidth

Aug 15, 2012

I need to find out what is killing my Ethernet wan circuit urgently, It is a Ethernet trunk port with v lans tagged across it.
its a 3560x switch.
I configured span with the replicate keyword, but I'm not seeing all the traffic I'm sure.
I'm using wire shark.
Is there anything I can do to find what is causing this?

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Cisco Switching/Routing :: 2610 Router What Speed Is Built In Ethernet Port

Oct 23, 2011

I have a 2610 router. How can I tell if the built-in ethernet port is only a 10BASE-T or if it's a 10/100 port?  Is there a "Show" command to give me this information or did it only come one way?  I have found conflicting information on this :-(  If it's only 10BASE-T, can I upgrade it to 10/100?

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Cisco Switching/Routing :: Additional Ethernet Switch Port For 2821 Router

Dec 18, 2012

I have a 2821 router and need to add another Ethernet port.
However, all the Ethernet modules seem to be End of Sale and the suggested replacements are only compatible with the ISRg2 range.

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Cisco Switching/Routing :: Errors On WS-C2950T-24 Switch Fast-Ethernet Port?

May 19, 2013

SW1#show interfaces fastEthernet 0/14 counters errors
 Port        Align-Err    FCS-Err   Xmit-Err    Rcv-Err UnderSize
Fa0/14           6682     140364          0     306468         0
 Port      Single-Col Multi-Col  Late-Col Excess-Col Carri-Sen     Runts    Giants
Fa0/14             0         0         0          0    180103         0      2798

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Cisco Switching/Routing :: C3500 XL Version IOS 12.0 / Error Add Interface Port-channel

Jan 15, 2012

a Customer ask me  to configure a etherchannel between two Switches C3500 XL Version IOS 12.0 follow the first configuration what I done and the output error show me by switch:

Sw01(conf)# interface port-channel 1  % invalid input detected at '^'  marker.   

I have to do something before add an new port-channel interface ?? why the Sw01 does not accept my configuration ?

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Cisco Switching/Routing :: 6513 / Port-channel Down But Duplicate Interface Created With (A) Up?

Nov 12, 2012

I have created 5 new 2 Gig port channels on a 6513 WS-X6516A-GBIC blade connecting to 5 4510R+E switches. 3 of the 5 Port-channels show up/up. 2 show down/down. However, for the 2 showing down, a duplicate Po interface was created with an "A" appended to the name that shows up/up. E.g:

Port-channel26             unassigned      YES unset  down                  down      
Port-channel26A            unassigned      YES unset  up                    up
Each of the 4510s has a second 2Gig PO to another 6513 with an identical config and all of those come up fine.

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Cisco Switching/Routing :: Configure Port-Channel Or Physical Interface On 3750

Jan 12, 2012

how to configure this. I did it in the past but kind of forgot how I did it.I have a stacked 3750 (two physical switches) connecting to a 2960.
I am creating trunk ports with limited access to VLAN 300, 600, and 700.
There is two interfaces connected from the 3750's(one on each physical stack member) to the 2960.I have the physical interfaces configured exactly the same.
3750 Config:
interface Port-channel2
 interface FastEthernet1/0/46
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1, 300,600,700
switchport mode trunk
speed 100


Should I keep the configuration on the physical ports and not configure the Port-Channel Interfaces? Do I need to configure port-channel load balancing? Is the channel-group mode sufficient? Goal is to basically create 2 links to the 2960 to double the bandwidth and provide redundancy.

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Cisco Switching/Routing :: Interface Resets Causes Port Channel To Flap Nexus 5010?

Feb 20, 2012

Here is an example of what each switch logs when a server drops offline.  Sample logs taken between 5:32am and 5:35am on Feb 20.   This particular one was having problems all weekend.  Switch #1 encountered over 2000 interface resets.  The corresponding VPC port on Switch #2 only had 13 resets.
 2012 Feb 20 05:32:09 q91-sw01-5010 %ETH_PORT_CHANNEL-5-FOP_CHANGED: port-channel10: first operational port changed
from Ethernet1/10 to none
2012 Feb 20 05:32:09 q91-sw01-5010 %ETH_PORT_CHANNEL-5-PORT_DOWN: port-channel10: Ethernet1/10 is down
2012 Feb 20 05:32:09 q91-sw01-5010 %ETH_PORT_CHANNEL-5-PORT_DOWN: port-channel10: port-channel10 is down
2012 Feb 20 05:32:09 q91-sw01-5010 %ETHPORT-5-IF_DOWN_PORT_CHANNEL_MEMBERS_DOWN: Interface port-channel10 is down (
No operational members)


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Cisco Switching/Routing :: C3550 - Configure Loop Back Interface On Gigabit Fiber Port

Sep 14, 2012

I am trying to configure a loop back interface like so: [URL], on the following device:

C3550 Software (C3550-IPSERVICESK9-M), Version 12.2(50)SE, RELEASE SOFTWARE (fc1on port gig0/1 which is using a 1000Base-SX adapter. This is for troubleshooting purposes and it does not appear to be a feasible option.  Is there another way to accomplish in the IOS?

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Connect Canon IP6600D Printer (USB 2.0 Interface) To An Ethernet Port On Wireless Router?

Jan 28, 2011

Can I connect my Canon iP6600D printer (USB 2.0 interface) to an Ethernet port on my wireless router so as to end up with a network printer?

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Cisco Switching/Routing :: Force Gigabit Ethernet Port To Be 1000 Full Duplex In Catalyst Express 500 Series?

Sep 1, 2007

Can we force the Gigabit Ethernet port to be 1000 full duplex in Cisco Catalyst Express 500 series?

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Cisco Switching/Routing :: VTP V3 - Primary Server Not Detected

May 16, 2013

We have a bit of a problem when deploying VTP v3 in our network. When command vtp primary vlan is issued, switch typically send query to appropriate multicast address in order to find out whether there is already some other one. The problem we are experiencing is that old primary server is not discovered, because it fails to reply on those multicasts.
This debug messages (from the old primary server )may be more describing.
*Mar  2 22:26:56.057: VTP LOG RUNTIME: Flooding Mechanism FLD-REQ: RX seq 1 ttl 1877620
 *Mar  2 22:26:56.057: VTP LOG RUNTIME: Flooding mechanism DB-ADD: seq 1 time 167216060
 *Mar  2 22:26:56.057: VTP LOG RUNTIME: Flooding mechanism FLD-REQ: TX seq 1. New TTL 1877621
*Mar  2 22:26:56.057:
*Mar  2 22:26:56.057: relay [Fa1/0/13]: 03 05 00 04 74 65 73 74 00 00 00 00 00 00 00 00   ....test........
*Mar  2 22:26:56.057: relay [Fa1/0/13]: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ................

So far, I haven't been able to find out the reason of this behaviour. In spite of that, no other strange behavior of vtp has been observed.

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