Switching

How to block MAC when the IP is already assigned to a different MAC address

Hi, Here is the scenario, my laptop is assigned with an IP 172.16.1.1 and MAC address is 'abcd.efgh.ijkl'. Now is there a way that if a different MAC address '1234.5678.9012' assigned my IP 172.16.1.1, when i am not available in the ofifce, it should...

RSPAN and SPAN Sources to Single Destination Port?

I am trying to configure a SPAN from two source ports to a single destination port. SPAN source 1 is an RSPAN session from a remote switch to a local destination port. I was able to successfully configure this. SPAN source 2 is a port on the local ...

Looking for suggestions on product selection

Hello everyone,First thanks for taking a look at my post I'm sure you guys are busy, and I appreciate the help. I'll start this off with I'm new to Cisco I've been watching videos online, and start my training course for CCNA: Routing & Switching nex...

Nexus 7000 OTV multicast configuration

Is multicast a required configuration when implementing OTV?thanks

Question regarding ip default-network command

Guys!! If i configure the route for example 200.0.0.0 (subnet is classful,)in my router as my default candidate, i am getting the output in the routing table as the gateway of last resort for that network, in addition to that i am also getting static...

Resolved! Packets not CEF switched / What is "CCE Output Classification"?

Hi,I noticed an 3945-SEC having quite high CPU load without doing much, because there are more packets Process-Switched than CEF switched.To investigate, I issued the following command:Router#sh ip cef switching statistics featureIPv4 CEF input featu...

Resolved! Cisco 3750

Hi All,Does any one know if Cisco 3750 supports 122-58.SE2 release.complete model no is: WS-C3750-48P any help will be much appriciatedmany thanks.

Resolved! How to "show" ME 3800 transceiver eeprom data?

z-core#show interfaces statusPort Name Status Vlan Duplex Speed TypeTe0/1 R-CORE connected trunk full 10G Te0/2 M-CORE notconnect 1 full 10G As yo...

Resolved! Cam Table Overflow attack

Hi Everyone,Layer 2 attack Cam table overflow floods the switch with bogus mac addresses Say PC 1 connected to switch port 1 PC 2 connected to switch port 2Switch has source mac of pc 1 and pc 2 on its cam table.Now if someone connects to port 3 an...

Errors on etherchannel link to Nexus

We have a port-channel from a 6509 to a vPC to Nexus 5k. Now one of the links has high errors, high input and CRC errors on the interface in the 6509, high output error on the Nexus.

Resolved! Configure Unused Vlan as Native Vlan

Hi Everyone,Can someone explain me benefit of configure unused vlan as native vlan in regard to security purposes?RegardsMAhesh

Problem with 2960S Console Port not responding

I am dealing with something I havent run into before. I have a switch (a 2960 S) that has stopped responding to the console port. I have tried several different USB to Serial adapters and they have the same problem. I can take those same USB adapt...

layer2 vlan reachibility

I have a layer 3 switch onto which I have created a layer 2 vlan and assigned 3 ports to this vlan, 3 PCs are connected to these ports. As per my understanding all there PC will be able to ping each other if configured with same ip...

[Nexus 7000] import/export between global table and VRF

Hi, ALL:According to:https://supportforums.cisco.com/docs/DOC-30871#1_Import_from_defaultvrfon an XR box I can import/export prefixes between GT and VRF (both ways). At least that's what I understand in that document.Can the same be done with NX-OS? ...