Questions tagged [interface]

For questions about a physical or virtual interface on a network device. For instance: Interface configurations, troubleshooting and security.

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Is an interface's limit independent of input/output?

Suppose I have a 10 Gbps interface in a router. Does that mean the maximum amount of traffic I can send through the interface will be some combination of input/output rates up to 10 Gbps, or can I ...
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1answer
4k views

How do testers (i.e. Fluke) get the port they're connected to?

At work I've been tasked to create a program that acts similar to Fluke testing devices (such as LinkRunners) but will be much more extensive and specific to our needs. One of the capabilities that ...
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1answer
599 views

How port, channel and interface are working together?

I do know about Physical port but a little knowledge about channel and interface, can any one explain how these 3 work simultaneously, i am not getting proper idea and from cisco i got to know about ...
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1answer
3k views

Routing on firewall vs L3 switches

So we have an environment with several VLANs connected to a FortiNet firewall using multiple interfaces trunked back to our L3 Dell PowerConnect 6248P switches. Currently the FortiNet is setup to do ...
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3answers
1k views

why does an interface card in cisco 1921 router not restart after cable disconnect?

I've got a cisco 1921 in a lab setting where we've added an extra interface (EHWIC-1GE-SFP-CU) and as long as a network cable is connected it works fine. However if the network cable is disconnected ...
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1answer
6k views

Packet Tracer: Ethernet interface up/down

I found that different interfaces have different behaviour on different device (router, switch) when no cable is attached on Packet Tracer 6.0.1.0011. Router's serial : down down Router's ethernet: ...
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2answers
6k views

SFP / Fiber Link Issue - Can't connect a Fiber CPE

I've a CPE connected to a 4506 switch. The interface is Up but I don't see traffic CPE MAC address on MAC sddes-table I've already replaced the cable, SFP and port. Now I've the minimal config (...
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1answer
5k views

what are IFL IFD and IFA

I came across terms like IFL IFD and IFA 's recently when studying some articles related to my project, I dont clearly understand what they are and the difference between them. I know they are related ...
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1answer
818 views

Router equipment and interface info in reverse DNS

Question about pages 17 and 18, of 49, at http://www.nanog.org/meetings/nanog45/presentations/Sunday/RAS_traceroute_N45.pdf It is mentioned that prefixes and numbers in DNS (when doing traceroute) ...
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1answer
12k views

time based interface shutdown on cisco router

Is there a way to shutdown an interface on a Cisco router based on time periods? I would like to shut the cellular interface when it is not necessary. Can this be done with the event manager and ...
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1answer
3k views

Find negotiated speed on Cisco router

I am a bit lost. I'm trying to find the physical interface speed that is negotiated on a Gigabit interface on a Cisco 2900 and 3900 series ISR G2. On a switch, I am used to giving sh interfaces ...

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