Switching

Hi I purchased the 2960 WS-C2960-24TC-L V10  a few years ago but never even opened the box. Today i went to set it up to add to the Lan. I get the following when connected via console cable. Not sure what has happened. and help with this would be gr...

Hi All, We have 2 x SFP fiber single-mode uplinks to the Core. one pair is working perfectly , the other got thousands of 46920 input errors, 42586 CRC. and the switch's log shown %SFF8472-5-THRESHOLD_VIOLATION: Te1/1/2: Rx power low alarm; Operating...

I received 2x 2960PCL switches that were shipped with IOS 15.0(2)SE6. I have attempted to downgrade these switches to 12.2(55)SE7 without success. So far I have pushed the 12.2 image to the switch via xmodem. When trying to boot from the image the sw...

We have a dedicated VLAN for voice and currently have a /24 subnet mask DHCP pool tied to it which allows for 253 addresses in our current setup. However, we are expecting 1500 clients on this voice vlan so we want to expand the pool to a /21 to allo...

Hi, I am not an expert and need to duplicate an automated system that used N.3 Switches "Stacked" Togheter. I need to use now CISCO 220 Series Switches but it seems this type of switch does not allow the "Stacking". I try to explain the "Old" use ca...

I was recently asked if there's any downtime associated with configuring failover on an ASA.  There is currently an ASA in production, and the plan is to add another ASA as a standby and to accomplish this with minimal downtime.  I didn't believe tha...

Hi, Is it not possible to do outbound queuing and shaping on an interface of the 6500 (Supervisor or 1G linecard), if there's a Priority queue? I don't want to shape the priority queue, but a different queue. I tried using 2 policy-maps, it takes th...

Hello, Are there MTBF numbers of the Nexus 56xx productline available? I am looking especially for the Nexus 5672UP switch MTBF numbers. I can't find them in the datasheet. Thanks in advance, Rob van Scheijndel

Dear colleagues,I appreciate your valuable help on this:I can ping from switch 2960S-1 the ip 192.168.250.26 but i cannot do it from switch 2960S-2 or my pc.I can also ping 192.168.50.1 from switch 2960S-2 or my pc.The routing at switch 2960S-2 seems...

We have a customer who gets the mac address tables filled in their Nexus 7000 switches. They have two WLC 5508 controllers connected to Nexus 7000 and it´s the wireless vlan that fills the MAC address tables. The Nexus 7000 supports 16,000 MAC addres...

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...