Switching

12 years as a firewall guy... and this is a first for me.I have a request to allow firewall access to an app that apparently uses tcp port 0.  I thought it didn't exist... but good-ol' google proved that wrong.  I did find this comment:  " Port 0 is...

OK guys, i am not sure if this is something with my DHCP setup or not, but it certainly seems to be the culprit.  I am running a 3560G and using it as DHCP and to do VLAN routing (eigrp protocol).  I have 10 pools configured with a few static address...

Dears,Our company will go to buy a core switch 4503, please I need your support in the following:-what is the difference between the Catalyst 4500 E-Series Supervisor 7L-E and the Catalyst 4500 E-Series Supervisor 7-E??Thanks,

Hi all,I have a Catalyst 4507 with SUP7L-E running cat4500e-universalk9.SPA.03.03.00.SG.151-1.SG.bin.The network diagram is attached.I'm trying to transport PAgP over dot1q tunnel but PAgP packets are not carried from one site to the other on any dir...

Hi !as we know, you can specify that the display of the  network mask appear in hexadecimal format or bit count format instead.  The hexadecimal format is commonly used on UNIX systems. The previous  example would be displayed as 131.108.11.55 0XFFFF...

Perhaps this is a daft question, but any assistance would be very much appreciated.I have two switches which I have setup independantly with a routed link between them. I.e. No switchport on an interface and assigned them both an ip address in a /30 ...

Hi, I am having issues with a simple dhcp server configuration where the client sometimes does not receive the location of tftp server (option 161).Below is the related dhcp debug snippet:Jun 19 19:13:53.165: DHCPD: client's VPN is .Jun 19 19:13:53.1...

I am trying to tune the QoS on some data centre switches: 2960G and 3750. I have read the configuration guide chapter about QoS, and the relevant parts of Tim Szigeti's book, but there are still some points that are not clear to me. I just want to un...

I have DHCP scope configured on my Core swtich.After i rebooted my core swtich i can  see dhcp conflicts error messages .Any way to void these conflict if another reboot of switch happensJun 7 23:36:22.662 UAE: %DHCPD-4-PING_CONFLICT: DHCP address co...

Hi,Scenario:SIP phones residing on LAN1 are configured in software to use mcast address 236.0.0.7, when the first SIP phone registers it sends an igmp join message which creates a group on the L2 switch, each subsequent SIP phone joins the group when...

I have a server connected to a access port with a default config and its in production. Right now, i want to configure that port to "spanning tree port fast".will there be any flap/packet drop if i configure to port fast ? QUICK RESPONSE WILL BE HELP...

Guys,we're upgrading over 40 of our 3550/3560 switches to the 3560x platform - what I have noticed is that we get quite a few PoE issues when migrating the site - for instance, 90 - 95% of the site's Cisco's phones will come up but not all of them - ...