Posted on in Networking
Here are a few tips that might be helpful if you are having trouble accessing your Cisco router or switch via the web server.
aaa new-model, you will …Posted on in Networking
If you need to disable spanning-tree on a particular VLAN in your Cisco-based network, use the following command:
Switch(config)# no spanning-tree vlan 13
This will disable spanning-tree on unlucky VLAN 13.
If you have some good examples of why you might want to disable spanning-tree for a VLAN, please …
Posted on in Networking
Not everyone has a great password maintenance process. If you run into a situation where the group pre-shared keys for your VPN are lost, you face the option of changing the existing key (and breaking any users that are currently working), or creating a new group with a new key …
Posted on in Networking
On occasion, you may need to put your Cisco IPS into bypass mode. Bypass mode allows the IPS to pass traffic without inspecting it. This may be useful if you suspect the IPS is causing a problem, if you are going to run a one-time scan that would set the …
Posted on in Networking
When you get your brand new Cisco ASR1000 series router, Stateful Switchover (SSO) is disabled by default:
Router# show redundancy states
my state = 13 -ACTIVE
peer state = 1 -DISABLED
Mode = Simplex
Unit ID = 6
Redundancy Mode (Operational) = Non-redundant
Redundancy Mode (Configured) = Non-redundant
Redundancy State = Non Redundant
Enable SSO!
Router# config …Posted on in Networking
You've certainly noticed when look at individual BGP routes on your Cisco routers that the route is advertised to specific update-groups. It isn't obvious from that output just what those update-groups are.
Router#show ip bgp 8.8.8.8
BGP routing table entry for 8.8.8.0/24 …Posted on in Networking
This is an annoying problem:
Switch#write
startup-config file open failed (Not enough space)
Switch#dir nvram:
Directory of nvram:/
%Error opening nvram:/ (Function not implemented)
1048576 bytes total (1034573 bytes free)
Cisco Catalyst switches simulate NVRAM on their flash. Once in a blue moon, this simulated NVRAM will become …
Posted on in Networking
If you see an error like the one below in your Cisco ASA log files, check with the other end and make sure your transform-set matches.
QM FSM error (P2 struct &0xd7fed708, mess id 0xcc86fb64)!
The QM FSM error message usually relates to a configuration mismatch. Although checking the crypto …
Posted on in Networking
If you're using policy-maps on your Cisco Catalyst switches to handle rate-limiting, you may have noticed that on some models, the show policy-map interface command does not seem to work. The CLI accepts the command and returns properly formatted output, but the output is all zeroes. There is no information …
Posted on in Networking
After cracking open a brand new Catalyst ME3400G, we weren't able to get it upgraded to the latest version of software. In fact, we couldn't even ping anything on the local subnet.
In order to use Cisco's Metro Ethernet switches, it's important to understand the new concepts that are introduced …
