Questions tagged [cisco]

The major provider of networking equipment. This is a generic tag to be used when no more specific tags are available. See the list of tags in Help Center Tag page.

Filter by
Sorted by
Tagged with
7
votes
3answers
772 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 ...
11
votes
3answers
5k 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 ...
11
votes
3answers
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 ...
10
votes
3answers
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 (...
16
votes
5answers
79k 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 ...
14
votes
5answers
717 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.
16
votes
4answers
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 ...
22
votes
3answers
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 ...
13
votes
3answers
34k 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 ...
14
votes
2answers
790 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 ...
8
votes
2answers
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 ...
21
votes
5answers
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 ...
9
votes
2answers
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 ...
23
votes
8answers
61k 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 ...

1
68 69 70 71
72