Questions tagged [cisco]

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A FEX port remains inactive - how can I bring it up?

When implementing Cisco Nexus 5k switches (5596UP), I connected a server to a dual homed 2000 FEX (2232T), the port belonging to a virtual port channel. However, the port changed the status from ...
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9 votes
3 answers
4k views

Does varying the angle of omni directional antennas affect connection quality between WiFi APs?

I use Cisco access points AIR-CAP1552E to connect buildings via WiFi, 802.11a/n (5 GHz). Normally, they are mounted upright, with three three omni directional antennas at the bottom. Now I consider a ...
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  • 3,354
7 votes
3 answers
2k views

What are the components and licensing of a full Cisco CUCME PBX?

I've been placed in charge of replacing an older Avaya TDM PBX with a new VoIP system that will integrate with Exchange (at least in the capability to transcribe voicemail messages and deliver them to ...
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  • 943
9 votes
4 answers
5k views

Cisco-configuration syntax highlighting for TextMate/Sublime Text [closed]

I would like to have syntax highlighting while perusing my configs - does anybody know of a good Cisco IOS syntax highlighting bundle for TextMate or Sublime Text? Edited (2015-09-21) to add: GitHub ...
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  • 623
13 votes
3 answers
12k views

How do I read optical transmit power via SNMP on Cisco ASR9k?

I am looking to read optical transmit and recieve power of XFPs in our ASR9k. The MIB used should be "CISCO-ENTITY-SENSOR-MIB" which is 1.3.6.1.4.1.9.9.91 and occording the ASR9000 documentation, this ...
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  • 1,373
8 votes
4 answers
3k views

Cisco 1260 AP no longer responds to ping, ssh after upgrade to latest 15.x firmware

I have a 1260 AP that I upgraded this morning. Prior to the upgrade, the system permitted ssh and would respond to pings on the network, however now it does not respond. I hooked up a serial cable ...
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11 votes
2 answers
5k views

catalyst 3750x - jumbo frames on svi

I've encountered a problem on a cisco ws-c3750x-48ts-s where jumbo-frames won't cross a trunk-connection between a vwmare esx-host and the switch. The access ports in the same vlan don't experience ...
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  • 111
9 votes
1 answer
687 views

TCP Client / Server in Cisco EEM 3.0

I'm attempting to set up client / server sockets in Cisco EEM 3.0 TCL with IOS version 12.4(24)T8 (this was recently upgraded to determine whether the problem was EEM ver). I have the following two ...
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  • 276
14 votes
4 answers
2k views

Is Nexus 7000 series line card "OIR" impact-free?

I have read many data sheets on the Nexus 7000 series and it's cards purporting to be capable of OIR (Online Insertion and Removal). However I have never needed to replace/reseat/add any Nexus line ...
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  • 8,258
6 votes
2 answers
320 views

Sending Cisco NCS/Prime Infrastructure reports without encapsulating them in a zip

Is it possible to configure Cisco NCS/Prime Infrastructure to send reports via email without encapsulating them in a zip?
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8 votes
2 answers
6k views

Cisco GET VPN Configuration - Best Practices/Can the loopback be used?

I am in the process of re-ip addressing a large number of remote locations, all of which are using a Cisco GET VPN/GDOI configuration for encryption of the traffic. In the process, I also wanted to ...
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11 votes
8 answers
20k views

I'm setting up a Cisco CCNA lab, what equipment would you recommend?

Is it okay to use a Cisco 2948 for CCNA students, after all it's cheaper to get these switches and they have more features? Wouldn't this be better than a 2950 switch?
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10 votes
3 answers
321 views

Mitigating bad/malicious IPv6 RA announcements

In a Cisco environment (ISR-G2), how do I prevent, or mitigate, incorrect RA announcements? I see Cisco has "IPv6 RA Guard"... But does that just run on the router and "fight back" with correct RAs? ...
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7 votes
3 answers
781 views

Can I run FCoE over Cisco Catalyst 5500?

I have 2 spare older Cisco Catalyst (not Nexus) 5500 switches. Would I need any additional hardware in order to run Fibre Channel over Ethernet (FCoE) over them? Do I need some kind of management ...
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11 votes
3 answers
6k views

What is the proper way to config a Site to Site IPSEC VPN and a Remote Access VLAN on the same external interface? Cisco 891 ISR

I'd be happy to post the config or logs for reference but I am having trouble getting my remote access VPN working on the same interface as my site to site IPSEC VPN. I am using a dynamic crypto map ...
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11 votes
3 answers
7k views

What are the alternatives to OTV for stretching a layer 2 network across 2 datacenters?

We want to find a "safe" way to stretch layer 2 network across 2 data-centers, and since we don't have any equipment running NX-OS on either data-centers we can't use OTV. So what are the alternatives ...
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  • 505
10 votes
3 answers
1k views

Routing with seperate WAN link for backups

We have two geographically separate data centers. We are preparing to implement a new WAN connection (dark cloud) that would be used only for backup traffic. The servers will have two NIC cards (...
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  • 1,331
16 votes
5 answers
81k views

What causes total output drops on a cisco switch interface?

I have an HP c7000 blade chassis which contains Cisco 3120X and Cisco 3120G switches running ios 12.2(58)SE1. The blades themselves are very lightly loaded yet many interfaces on different blade ...
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14 votes
5 answers
719 views

In a multi-tenant environment what should be done to make your switchports silent on Cisco and Juniper switches?

For example preventing it from sending arp, stp, etc and to reveal as little as possible about the rest of the network. Example use case would be connecting to a peering exchange.
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  • 1,675
16 votes
4 answers
5k views

Why does this router fail to use multiple, equal-cost routes from OSPF?

A Brocade router running NetIron 5.2, and a Dynamips emulation running IOS 12.4 both fail to dependably use equal cost paths in what seems to be a very simple configuration. I say "dependably" because ...
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  • 869
22 votes
3 answers
62k views

Protocols: EIGRP vs OSPF [closed]

EIGRP and OSPF are both IGP protocols, the former is a mostly Cisco protocol and the latter is a well established open standard. What are the benefits of one over the other? Put another way, when ...
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13 votes
3 answers
35k views

Mac-flap due to roaming clients on wireless

We are running an Aerohove wireless network (controller-less).. I occasionally get mac-flaps within the VLAN tied to a SSID. I know this is coming from a roaming client.. The problem is that the ...
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  • 894
14 votes
2 answers
792 views

Wireless Probe Request Forwarding Best Practices?

I'm working with a couple Cisco WLCs and I know that they use information about client signal strength in determining device locations but I was reading up on "probe requests" and found that, by ...
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  • 315
8 votes
2 answers
2k views

Nexus 2000 pinning best practice

As many known the Nexus 2000 series is a switch which allows a distributed fabric in DC networks. Pinning Nexus 2000 is quite a breeze. I was looking to seek discussion and a general consensus on what ...
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  • 347
21 votes
5 answers
28k views

Cisco ASA site-to-site VPN failover

We recently replaced international MPLS with new ASA 5510s and site-to-site VPNs. However, when we deployed this we ran into a problem where each remote location has 2 ISPs for redundancy, but when ...
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9 votes
2 answers
15k views

What is Dec MOP and how to disable it?

Performing a packet capture I keep seeing strange "DEC MOP Remote Console" frames: No. Time Source Destination Protocol Info 141 83.557841 Cisco_57:62:a0 ...
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  • 503
23 votes
8 answers
62k views

How can I force VTP clients to update their VLAN database from the VTP server, on Cisco devices?

I was doing some cisco exercises on configuring a vtp server and client, something I can't figure out is : I setup a vtp server, added my VLAN's I then took another switch that was attached to this ...
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