Other Network Architecture Subjects

I just installed this new 4506 with sup2+ and 5x4248 modules, and IOS V2.12.25SG. CPU at time goes as high as 99%. One of the task that stands out in 'sho proc cpu' is 'PM callback' going 80-90% cpu. Whats this process doing and why it consumes so mu...

Is it possible to rate limit a port on a 4912g (catos) gige switch to say, 400Mbps? I've seen service-policy on IOS switches, but can't find anything similar for catos. Some examples would be great.My alternative is using CAR on a 6500 switch with a ...

I have read multiple documents on QoS configuration for the Catalyst 6500 and I am still confused on several points.I understand the internal DSCP value is determined at the ingress be either the trust command or if the port sets cos for all packets....

I am seeing network traffic to/from hosts other than the one I am monitoring from without the use of a monitor port. For example, I can see all of our web server traffic for any host connected to the same switch (2950 and 3550 switches). This happens...

When capturing traffic for ONE vlan using the NAM I can see two copies of the same packet for every packet sent. Can anyone explain this.Thanks in advance.

How come say if I have a router with 2 ethernet ports, plugged into a switch it doesnt cause a loop ?

i know upgrading an IOS will have more features like NAT,Multicasting,IPX, etc....., but though my existing switches & routers has the same with the older versions, what is the necessity to upgrade new IOS eg. old IOS ver is 12.1.22 & new ver is 12.2...

Here's my issue:I have 4 data VLANs in my network and am using a 6509 w/ SUP720 to route for them. I am using an ASA for firewall and that is working just fine. The problem is that I cannot get any of the VLANs to route outside. On the ASA I have ...

how can we find the vlan number if we have the ip address of a particular machine?

Hi Since we installed the new network we have on our 6500 Giant Frames on the Trunkports(dot1q)and rapid spanning tree to the access-switches. All Accessswitches are running without problems and errors. Also on the Etherchannel between the 2 6500 i h...

Hi,After many tries and advices i still can not configure my router properly...So i am uploading the topology, a file with the wired (and operational - Config_1_BVI1.txt) configuration, and a file with the last try...On this topology the wired part w...

Anybody know how long a mac address stays in a Cisco IOS arp cache when issuing "show ip arp"? How about a mac address in a CatOS switch when issuing "show cam dynamic". What constitutes the length of time an arp entry is cached?

I added a secondary IP address to an interface and I cannot ping any hosts on that subnet unless I use extended ping commands and ping from the secondary IP addresses as the source. Why would that be?