Switching

Hi All, I would like to know if we need to enable ip dhcp snooping and ip arp inspection on the core switch as well ? The switching design is a collapsed core with multiple access switches and there is a Microsoft DHCP server reachable through routin...

Layer 4 uses psuedo header to calcualte the checksum and layer 3 uses all the values in IP header to calcualte the checksum value. But at Layer 2 ,CRC is calculated from ethernet header and payload.From layer 2 point of view payload is made up from l...

Hi, I just get information, that my customer have 2 Nexus 7010 and they want to make 2 chassis to be a redundant mode (active-active) but, i see Supervisor Engine module is different each other. first Nexus 7010 comes with a Supervisor Engine N7K-SU...

We have 2 disconnected Data Centers using the same IP addressing scheme on all servers. Ex: Server-1 at DC-1 10.0.0.1/24 Server-2 at DC-2 10.0.0.1/24 We are being told sense we have Nexus 7010 switches we can connect these Data Centers using OTV. ...

Hello, Today I had to change a stack of  2x 3750 switches by a stack of 2x 3750X. then linked the whole phones as they were linked to the first stack. I copied the exact same run configuration from the first stack and add it the new stack. When the n...

Hi All,I'm not new to Cisco and but I've got this shiny new 4506 chassis with a Supervisor 8E and single (for now) 48port UPoE line card.The config I have set up seems to be working, but some of the items we plug in for PoE don't seem to come up. (Th...

Having used Cisco Network assistant to upgrade some of my switches to the newest revision (15.0(2) SE9), although the switch is on-line and I can access via telnet, all of the HTML pages are inaccessible and it shows as off-line in Cisco Network assi...

We have a 7004 running 6.2(14).  Servers, both data and VoIP are easy to get setup.  Was looking for example of how configure a FEX port to support an IP phone. We have multiple 2960 edge switches with all the QOS stuff.  Wonder if there is anything...

Hello, I just wanted to know when the Aging Time for a respective MAC address should be updated by the switch. There is a N5K switch that reset/update the Aging Time for a MAC every 30 seconds or so. Is this normal? I guess no.

Hi We just got three 2960-X switches (WS-C2960X-48TD-L) connected with stack cables. When all three are powered off and I power them on they boot as usual and stack forms nicely. But if i enter "reload" command only two switches reload and then refor...

Dear Friends, Please help me soon. I have two Cisco 4500 x Switches running on VSS i have a stack connected on 1/1/4 , 2/1/4 port channel. The 4500 X is connected to the fortinet firewall & have added the reverse routes too. ( FW inside IP : 10.18.1....

Dears  i have a customer that wants to activate FCoE on Nex 7700 on a F3 module(N7K-F348XP-25) but am confused with licensing what licensing needed to enable FCoE on the card do i need (Advanced Services Package(N7K-ADV1K9)) to activate the storage ...