The cisco-commands tag has no wiki summary.
6
votes
9answers
266 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 ...
10
votes
1answer
133 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
136 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
36 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?
15
votes
3answers
293 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 ...
8
votes
2answers
118 views
6
votes
3answers
159 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
228 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
59 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
111 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
184 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
153 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
234 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
111 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 ...
5
votes
1answer
71 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 ...
21
votes
18answers
2k 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 ...
6
votes
4answers
148 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 ...
