Switching

Hi All,We have a 3750x switch with some issues on the arp. Our servers become unreachable for some time, buy when I clear the arp cache, I am able to ping the server again. I have tried adjusting the arp timeout but I don't think doing so would be th...

I need to refresh three 6509 chassis (non-E) along with the Sups. I am looking at these two sups:WS-SUP720-3B vs VS-S2T-10GCan anyone provide some feedback to assist in my decision making process? Pros? Cons? We are not using VSS and don't have any p...

We recently wanted to swap our existing WS-SUP720-base with a WS-SUP720-3B in a 6513 chassis.Had the existing configuration config saved in a txt file and replaced the supervisor. Booting went fine and we pasted in the original config. There was one ...

Hi,It's my understanding that MSTP switches must have the following identical information configured in order for it to participate in a region:NameConfiguration revisionVLAN-to-MSTI mappingDo all VLANs need to be created on all switches in the regio...

Could someone explain me if the numbers mentioned below are on the same subnet or not.172.16.100.1/ 21 and 172.16.100.2/ 21/ 21 = 255.255.248.0 0---------78---------1516I know how to find the subnet mask, but in this particular case I have some doubt...

Hello everyone. I have a question regarding the 4948-E switch. i have a couple of QinQ vlans comming in from a supplier. In thoose QinQ Vlans i have a number of different vlans. So far very straight forward. I would like to strip the outer Vlan tag w...

Folks,After I added the 3rd 3750E to my stack on Sunday I can no longer save my configs with 'copy run start' or 'write mem':#copy running-config startup-configDestination filename [startup-config]?Building configuration...nv_done: unable to open "f...

The setup 2 6506’s with single SUP32’s in each, running OSPF with one area, SW6 is Full/DR & SW8 is Full/BDR. HSRP is configured on both switches with SW6 Active and SW8 Standy. IP SLP is configured with a single vserver using VLAN14 and SW6 is stand...

Hi All,Consider the following scenario:                   An IGP is running between D-SW1 and D-SW2. They both advertise the Routes 10.0.0.0/24 and 20.0.0.0/24 to each other. However, since these are also their CONNECTED ROUTES, therefore, because of...

I have a very basic question regarding PVST. Consider the following topology:My quiestion is that will SW2 respect/consider/will take any action/reply to the BPDUs it recieves from SW1 for VLAN1,2 and 3 as these are not activated on it? Same is for o...

Hello,One of our clients wants to implement the following topology:+----------+C|Cisco 2921|<---------++----------+          |                      |B+----------+    A+------------+D| Internal |---->| Cisco 2960 |----> ISP+----------+     +----------...

Hi,Having trouble with DDNS on the Cisco 851, trying to get it to connect with my own DDNS server which works fine with the software client so I'm trying to get it to work with a Cisco router.Here are some of the relevant bits of the config:ip name-s...