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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votes
5answers
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IPv6 address assigned to vlan interface of 3750 switch changes

When setting up my 3750 stacks, I enable IPv6 on the Vlan1 interface so that I can manage the stack over IPv6. The stacks are not doing any layer 3 routing. However, it seems that the IPv6 address ...
5
votes
4answers
8k views

Multiple IP Addresses on VLAN Interface (SVI)

Let's say that there is a SVI for VLAN 100 and it's been assigned the first usable IP address in subnet 192.168.1.0/24. There is a host on VLAN 100 with an IP address of 192.168.1.130. We need to ...
2
votes
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: ...
4
votes
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 ...
7
votes
2answers
3k views

SVI as a DHCP client

Can a Cisco switch be configured to have a management interface (or SVI, or VLAN interface) become a DHCP client, therefore obtaining its own IP address on the respective network? This is out of ...
3
votes
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) ...
6
votes
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 ...
5
votes
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 ...
6
votes
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 (...
17
votes
7answers
56k views

Cisco command to show which interfaces an ACL is applied to

For Cisco routers and switches, is there a show command, or something similar, that will display what physical and logical interfaces an ACL is implemented on and what direction it is applied in? I ...
2
votes
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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