Used for questions about the commands for Cisco devices.
1
vote
1answer
97 views
How do I enable a DHCP server on a Cisco Aironet 1250 series or 1260 series AP?
I need to enable or disable the DHCP service on one or both of the Cisco APs in the title (well any Cisco AP if there is a standard method), running on running RHEL v15 or v16.
I would very much ...
4
votes
1answer
74 views
“Protected” switchports on a Cisco 881W
I want to configure a Cisco 881W to deliver Corporate wired and wireless connectivity, plus Guest wireless connectivity on a second SSID, connected to the core by a site-site VPN. I was expecting to ...
0
votes
1answer
116 views
Creating multiple trunk ports on a Cisco ME3400
I have a cisco ME 3400 switch . And I have configured fa0/23 as trunk port and connected this to a router for carrying multiple vlan traffic. And i have created some vlans eg: 1500, 1501 etc and added ...
2
votes
1answer
98 views
Cisco router dot1Q monitoring
How can I monitor on a Cisco router if dot1Q packets arrive on the trunk interface or if others arrive on that interface (like ISL, the old protocol of Cisco)?
How can I do this and what is the best ...
4
votes
1answer
339 views
time based interface shutdown on cisco router
Is there a way to shutdown an interface on a Cisco router based on time periods?
I would like to shut the cellular interface when it is not necessary.
Can this be done with the event manager and ...
8
votes
1answer
445 views
QoS between two VLANs with Cisco 881 Router (IOS)
I'm hoping to get some advice regarding the best practice to delegate a limited Internet connection between two VLANs. In my case one VLAN is for an office network, and the other is for guests. What ...
3
votes
1answer
615 views
Enabled VPN — Site to site — Cannot access internet now .. Cisco ASA 5505
I had just enabled site to site VPN access ... I am assuming something got messed up with NAT ... It's the strangest thing .. I cannot find anything wrong through ASDM, or CLI .. Yet, I can ...
6
votes
2answers
380 views
“Local Policy Denied Prefixes” in 'show ip bgp neighbor' output
I've been spending the last week or so troubleshooting some (maybe related, but probably not) issues with Quagga. I have a test router - 7204VXR-NPEG2 running 12.4(24)T6 - with a single BGP session to ...
5
votes
4answers
2k views
Reconfiguring Layer3 Switch to enable IP routing and become the default gateway
Current configuration with HP Procurve 2848 switch at a colocation facility consists of using the ISP switchport as the default gateway. The current configuration is very basic with only 1 vlan assign ...
6
votes
1answer
681 views
About the inside local and outside local and inside global and outside global
I have some concept problem with the NAT. Here is the Cisco definition for the local and Global and the NAT operation.
Local address—A local address is any address that appears on the inside ...
5
votes
1answer
285 views
Chassis temperature and Fan status on Cisco 3548 switch
I need to remotely check the status of the fans and temperature of a switch that I currently do not have physical access to. I have done so in the past on a 2950 with the command:
Show environment
...
7
votes
1answer
759 views
Cisco IOS: Show ip route output order
I am runing some BGP tests through the lab before rolling them out in production (thus, any IP addresses or AS numbers etc used here are done so in a completely fictitious manner).
Something that has ...
5
votes
2answers
368 views
SNMP and Syslog in configuration
Really stupid questions guys so I apologize. When sending Syslog messages to a server we use the command logging x.x.x.x. I get that part.
SNMP is used to gather stats or change configurations on ...
11
votes
2answers
798 views
Cisco - display ALL routes using a single command
In Junos when you use a show route it displays the routing tables , starting with inet.0 ( global routing table) and then listing each VRF in alphabetic order.
I am after a similar command , for the ...
5
votes
2answers
403 views
Configuring redundancy using floating static
I wanted to post my network layout, but I dont have the required reputation. So I have made up a network diagram below:
ISP
/ \
/ \
/ \
HQ------Branch
| ...
4
votes
1answer
172 views
How do I create an SSL CSR via CLI for Cisco Prime?
I'm trying to create a csr for a cisco prime server.
I managed to create a csr and put it in the "defaultRepo", which is local on the disk. After what I've read I need to create a certificate repo ...
8
votes
11answers
710 views
Locate a host on Network
What is the best method of locating a particular workstation on a VLAN ?
I sometimes need to do this, if a workstation IP address, shows up on an ACL Deny
torrent use
High bandwidth usage (Top ...
12
votes
1answer
383 views
BGP “no synchronization” command not showing up in running-config
I noticed in the running config I don't see the no synchronization command under the BGP section. Is this a default command so I won't see it unless I change it?
Hardware / software
Cisco 1921
...
3
votes
2answers
336 views
OSPF LSA Refresh Time
Is there a Cisco command that would allow one to modify the default value of 1800 seconds (30 min) for the OSPF LSA refresh rate?
1
vote
1answer
73 views
How can I log authentication errors in 3G routers?
What command (debug) can I use to see authentication errors on a cisco 3G router specifically for the 3G connection?
16
votes
3answers
3k views
Accidentally Removed Allowed VLANs from Cisco Switch Dot1Q Trunk
I am adding a new VLAN to an existing trunk port between two Cisco Catalyst switches (3750's). In the process of adding the new VLAN, it appears that I've removed the existing allowed VLANs on the ...
9
votes
2answers
470 views
6
votes
3answers
216 views
Why does “show adjacency” take so long to run?
Why does the "show adjacency" command take so long to run (in the order of minutes) on Cisco IOS Software, 7200 Software (C7200P-SPSERVICESK9-M), Version 12.4(4)XD5, RELEASE SOFTWARE (fc1)? The ...
7
votes
5answers
450 views
How can I speed up CLI typing in Cisco IOS using shortcuts?
I know we can use auto-completion (tab key) and abbreviated commands (such as sh ip int bri) to speed up typing.
However, I'm still not satisfied with typing crypting chains such as sh ip dh sn bi | ...
4
votes
1answer
468 views
Cisco 867 forward UDP port range
I need to forward an UDP port range to a specific private IP address in my LAN.
In order to forward one port to an internal IP I do:
access-list <acc_list_number> permit <port_type> any ...
7
votes
1answer
4k views
Cisco config example for Policy Based Routing
I find my self in a situation I was in not too long ago, but I can't
remember how I resolved it :)
The Scenario
I have a Cisco IOS router with a LAN interface (fa0/0) and a WAN
interface (fa0/1), ...
9
votes
1answer
213 views
Deconfigure an interface in IOS with one command
I was wondering if there is a single command to clear a single network port's configuration? (wipe switchport, portsecurity,...)
7
votes
3answers
2k views
Cisco: prevent vlan's of communicating with eachother on cisco router (ACL alternative)
Setup: Cisco router with multiple VLAN's configured on it.
How can you prevent 2 VLAN's communicating with eachother? Normally I would do this with ACL's like this:
access-list 102 deny ip 1.1.1.0 ...
7
votes
5answers
2k views
Monitor specific traffic type on a Cisco router
Is it possible to monitor a specific traffic type going through a cisco router? (like monitoring via wireshark)
Ex: I want to monitor http traffic specifically that is passing through a router. (or ...
3
votes
2answers
386 views
Cisco: No autostate on GigabitEthernet interfaces, any alternative? (not working)
I recently tried the command "no autostate" on a GigabitEthernet interface (on a newer router) and this didn't work anymore, does anyone know why this is occuring? This use to work on FastEthernet ...
8
votes
1answer
712 views
PPPoA ADSL Configuration with external modem on Cisco 891
Context
We use Cisco 891 routers as CPE for several client sites. They are all running IOS 15.
Cisco IOS Software, C890 Software (C890-UNIVERSALK9-M), Version 15.0(1)M8, RELEASE SOFTWARE (fc1)
The ...
23
votes
21answers
5k views
How can I see which switchports are not in use?
On a large Cisco Catalyst switch stack, almost all switchports are patched. I need to identify the ports, which are not in use, for connecting further devices.
Following switchports, cabling, patch ...
7
votes
4answers
6k views
How can I reset a VPN tunnel on a Cisco ASA?
On a site-to-site VPN using a ASA 5520 and 5540, respectively, I noticed that from time to time traffic doesn't pass any more, sometimes just there's even missing traffic just for one specific traffic ...
