All Questions
38
questions
1
vote
1
answer
882
views
MAC address table and frame forwarding on Layer 2 switches - question about when two computers are connected via hub to same switch port
My apologies if this is not the right forum to ask this, but I am a newbie when it comes to networking. I am currently going through the CISCO Networking Essentials course, and one of the Activities ...
- 125
1
vote
2
answers
474
views
Can you stack Cisco 350 28P PoE switches with CAT5E or CAT6 ethernet cables?
I have four new Cisco SG 350 28P PoE switches, but no stacking cables. Can I use CAT5E or CAT6 ethernet cables to accomplish stacking them?
- 11
2
votes
1
answer
1k
views
Cisco nexus 9396PX TX output discard on 40G interface without link congestion
We have cisco nexus 9396PX with N9K-M12PQ module (12x40G Interface), We have 8x10G L3 LACP bonded connectivity with our ISP and so far so good no issue at all. but recently we migrated that LACP LAg ...
- 4,379
1
vote
0
answers
387
views
How Cisco Line Protocol works
How do Cisco Line Protocol works ?
I could read this: https://www.cisco.com/c/en/us/support/docs/content-networking/keepalives/118390-technote-keepalive-00.html, about Ethernet Interfaces keepalive ...
- 1,085
5
votes
3
answers
6k
views
How to debug L1 Auto negotiation issues?
One of our Linux hosts has started switching its gears recently. While checking the interface speed, I could see that the interface has switched down to 10Mbps. The NIC and Switch are capable of 1G ...
- 1,412
5
votes
2
answers
687
views
What is the springing mechanism for on the top of this transceiver module?
Some Ethernet SFP modules have them, some do not. What is the yellow springing mechanism and the attached metal wire meant for?
- 153
2
votes
2
answers
960
views
When should the portfast command be used on Cisco switches
Cisco literature states that the portfast command should only be used when connecting a single end station to an access or trunk port.
Can some clarify what is an end station in this context?
Using ...
- 499
10
votes
2
answers
2k
views
Can a switch that does not support VLAN process traffic from a Trunk that is not the native VLAN
Recently encountered a setup where the engineer had a Multilayer Cisco switch with a trunk carrying VLAN 41 to an HP switch that did not support VLANs.
What should the HP switch do with the 802.1q ...
- 499
2
votes
2
answers
2k
views
Changing ethernet wiring for Cisco pre-standard PoE
I have a set of 7912G IP Phones, which only accept Cisco pre-standard PoE. To save myself buying a Cisco switch, is it acceptable practice to change the wiring of my ethernet cables slightly and use a ...
- 185
2
votes
2
answers
2k
views
Can I connect to Cisco router's AUX port from a switch Ethernet port?
I know from this question console connection via Cisco router's AUX port
that it's possible to connect from a Cisco router to the switch/router's console port but I would like to know if it's ...
- 145
2
votes
2
answers
12k
views
Show RAM usage Cisco 2960
I'm trying to see how much RAM is being used by each switch.
The switch is a cisco WS-C2960-24TT-L IOS version 12.2.
This is what I am seeing from the switch when I run the show version command.
...
- 23
6
votes
1
answer
1k
views
What should a device do with an Ethernet frame larger than its MTU?
When I test with Cisco 2960 series switches or with ISR routers, then if port receives an Ethernet frame larger than its MTU value seen in sh int output, then device drops this frame and increases the ...
- 1,109
2
votes
1
answer
601
views
Cisco 6500 Port Lights
I was wondering if anyone knows if there is a way to change how to port lights function on a 6500 switch.
Most switches work like this...
No Light - Port in shutdown or no connection
Solid Orange - ...
- 123
2
votes
2
answers
58
views
Is it possible to design a network switch that could work only with combinational or sequential logic circuits without a software?
And if it is possible are there any companies that are building these type of switches ? Are they/would they be much more expensive than a regular switch which has a more 'standard' processor and is ...
- 1,541
1
vote
2
answers
11k
views
Cisco Nexus 5548UP upgrade from 5.0.3 to 7.0.1
We have one cisco Nexus 5548UP L2 switch running very old software 5.0.3 version but recently i got 7.0.1 software from someone else (we don't have SmartNet on this switch).
is it safe to upgrade from ...
- 4,379