Switching

Two nights ago I replaced my sonicwall with a cisco 2811.  Everything was great, untill the next morning.  Around 9:30am internet stopped.  I was able to ping out by ip but not name.  I logged on to the dns server and found that I could ping internal...

Hello,I have a question regarding VSS I thought I'd post here.  According to Cisco, "If for some rare reason all VSL connections are lost between the virtual switch members leaving both the virtual switch members up, the VSS will transition to the du...

Hi All I use ping to check the speed of Layer 3 network. In addition to this, What tools can be used to detect low speed of layer 2 and 3 ?  Thank you ! Showip

Can this cause dot1x authentication failure. When I put dot1x on my switch i get the same ports that authenticate initially but within 25 hours they fail authentication. When I remove dot1x I get continuous "LINK-3-UPDOWN & LINEPROTO-5-UPDOWN" on the...

Hi I just cant ping the HQ router here. Tried to ping from a PC from different VLANs, no use. For example, when i ping from PC0 to 192.168.2.3 (which is the F1/0 interface of the HQ router) it fails and outputs this message from the cmd:   Reply fro...

Hello, I have the following setup and everything is working fine.3 HP switches in Suite A each with an uplink to the core another HP switch, 3 HP switches in Suite B each with an uplink to the core. The 3 switches in each suite are not interconnected...

Hi,  So we are extending to a new floor in our building and I want to have a separate set of vlans for the PCs and phones there so that its easier to point out the location by an IP address. I can't seem to figure out this one little thing, All our P...

Hi all,On my two Cisco 3020 switches (please see attached pic) I see many syslog messages:%SW_MATM-4-MACFLAP_NOTIF: Host MAC_ADDRESS_OF_SW3 in vlan 100 is flapping between port Gi0/21 and port Gi0/23This interface flapping messages are for all vlans ...

Cisco Packet Tracer assignment. Help, pleasePlease See attached pktI did not understand the topologyI do not understand how should ‘TEST PCs’ communicate w/ any VLANGuidelines to follow-Each PC should be on the VLAN specified-The access point should ...

I cannot figure out why the ACL is not working on a 3750 running 12.2 (55)SE on a trunk port.  For testing, there is 1 x IP (10.101.15.13) that should be denied to all VLANs on the trunk.  I have tried standard and extended list, but neither seem to ...

Hello all,We had problems with voice quality recently. The issue was with local calls between analog and IP phone or between analog phones (each connected to different voice GW) while crackling was heard only on IP phone. It all pointed to QoS since ...

Hi allDatasheet says about acl on n3k:Standard and extended Layer 3 to 4 ACLs include IPv4, Internet Control Message Protocol (ICMP), TCP, and User Datagram Protocol (UDP)I would to know that I can create Standard and extended Layer 3 to 4 ACLs inclu...