Other Network Architecture Subjects

Hi All,L2 security documents suggest to avoid using vlan1 and tagging all frames with vlan IDs using the global configuration of vlan dot1q. Other Cisco non-security documents suggest using the switchport trunk native vlan # which removes any vlan ta...

Dear all,We have two Catalyst 3550 switches on the core level, and several Catalyst 2924XL switches on the distribution level, with several VLANs trunked using 802.1q encapsulation and HSRP for gateway redundancy.Recently we have encountered intermit...

Please allow me to ask a simple question. Does Gigabit ports( Uplink ports ) of 2950SX-48 support EtherChannel feature ?Thanks : )

Hi,I need to connect my distribution switches to my core switch. The solution I came up with is buying a WS-X4448-GB-LX module for the core swich and GLC-LH-SM SFPs for my distribution switches. Is this correct?Any help would be appreciated.Regards

Hi All,I need to establish connection between my office and ISP. I need to have one Fast Ethernet and One Serial interface, I also need VIOP enabled. What is minimum model of cisco router which supports this and Cost of it Approximately ??Thanks.Sure...

Hello,I'm currently blocking multicast on a edge port of access switch using "switchport block multicast". The only user of multicast addressing is HSRP, and edge PCs don't need to receive HSRP packets.This command is supported on Cat 2950 EI and on ...

Hello, I'm not sure if someone has come across this before. But they might enlighten me. Under what circumstances would you see ARP enteries on a switch for subnets out side of the local subnet?Example 2 switches back to back everything in defa...

Hello,can anybody tell me, how to configure thescenario below on a cisco 1841?My cisco is standing behind a isp router,which makes nating.i would like to create a vpn tunnel from the cisco 1841 to another cisco 1841, which is standing behind an isp r...

Is is possble to nat the destination address. What I am trying to do it change DNS servers. I would like to have traffic going to the old address be natted but traffic going to the new address not be natted. Finally if the DNS devices generates tr...

I just purchased a Catalyst 5509 switch with the supervisor III engine and 8 24 port switch modules, however, it doesn't have a Router Switch Module. What kind of router would I need to be able to define a trunked port out to the router to do inter-...

Hi evrybody, we have a router with one ethernet interface and one ISDN BRI port.Wireless Broadband link(primary link) is terminated on ethernet interface.And Backup ISDN(secondary link) is terminated on ISDN BRI port.The problem is that wh...

What does dispose udp.no port mean? I'm trying to troubleshoot some dhcp problems, and I see on the MSFC, when doing a debug ip error detail, I see UDP src=68, dst=67 dispose udp.noport.

Hi,We have a Catalyst Switch 5505 CatOS 6.4(1)in slot 4 WS-X5224 .and in some interface appear error "Rcv-Err" wath mean this error? is possible find a solution a this error?Best Regards,Victor

If I have a linux svr & want to do network bonding on it ( 4 nic's ), lets say I have a 192.168.20.104, 105, 106 and 107 as IP's. What do I have to on the Cat to support this?Here's a link on network bonding... http://www.novell.com/coolsolutions/fea...

Hello,Is there an issue with Cisco switches not negotiating port duplex and speed issues? We are finding ourselves running around having to fix these settings on most ports and on various switch models. Any thoughts or suggestions or comments, grea...