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Cisco Access switch is dropping large amount of end points

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http://serverfault.com – This afternoon, with no changes to the network, a switch suddenly started dropping off lots of connections. These connections would come back up a few minutes later, then another area connected to the switch would drop off. This is an older 4006 chassis switch which could in and of itself be a problem but I'm looking to see what else you all would look for in trying to find a root cause. Switch is connected via ports 1/1 and 1/2 in an etherchannel to a VSS core 1/1/42 and 2/1/42. Both sides are up and working however the CPU on the switch will spike up to 99% and that's when CRC errors s (HowTos)

xskl's picture
Submitted by xskl on 09/11/2012

Stories similar to Cisco Access switch is dropping large amount of end points

I have three switches I'd like to configure in a loop - a Cisco stack (3750s) and two HP 2900 series. Each is connected to the next with a 10 gig backplane of one form or another.

How do I configure the spanning tree on these systems to make this function correctly?

I have a Cisco 2950 switch which has one of its ports connected to an Internet router provided by my ISP; I have no access to the router configuration, but I manage the switch.

If I leave all switch ports with their default setup (auto-negotiation of speed and duplex mode), this link always connects at 100 MBit/s, but in half-duplex mode.

I've tried replacing the cable, and also moving the link

If I have a network like:

Group1 -> Switch -> Switch -> Server (configured as gateway by DHCP) Group2 -> Switch -----^

(Hope that makes sense...)

When computers in each group send packets to other computers in the same group (so same switch), will the packets go all the way through the second switch to the server and back again or will they go directly to each other via the first s

I'm looking for a way (kernel patches, configuration, etc) to bond multiple network interfaces together ... but for limited purposes.

Here's the setup. Machines A, B, C, and D each have 4 NICs, each of which are on separate unmanaged switches. The connections are made in a corresponding way ... e.g. eth0 of each machine are connected via switch 0, eth1 are connected via switch 1, etc.

We have Cisco Catalyst 4507R running IOS v12.2 that appears to be dropping valid DHCP requests.

I just replaced the old HP ProCurve switch with a new Cisco SG 300-28P managed switch. It has PoE on all ports. Everything works, except for my domain server that went offline and the network interface appears to be dead. Windows says the network cable is disconnected, and no lights blink on the switch.

I have the following devices on vlan93 on my network:

pfsense (192.168.93.1) core-sw1 (192.168.93.2) edge-sw1 (192.168.93.3) pf-switch (192.168.93.100) devices (192.168.93.120)

Physical connections below (all connections are tagged except for pf-switch → devices):

+----------+ +------------+ +------------+ +-------------+ +----------+ | | | | |

We have a single HP Procurve 2410G-24 Switch.

For the sake of simplicity, there are 2 VLANS configured, and the ports are roughly equally split between them.

We have a switch that is contained within a locked enclosure that draws air into the enclosure. The building is a foundry and during the summer I am told the ambient temperature can get very hot (new hire so no data to back this up but I won't doubt it).