High Packet Drop and connection failure

The 2910-1 to LTM tests pretty much verifies the hardware/cabling is good. Let's dig deeper for an app or utiliization issue.

 

 

1) When you issue a "sh int" on the Cisco switch, is the negotiated line speed/duplex correct?

 

2) Have you polled the bigip interfaces with a mgmt/snmp tool to check utiliziation? Or what is the utilization on the Cisco port side?

 

3) The 1600 is only rated at 1gb. Marketing aside, the advertised rate for ANY vendor means total throughput. That is 1gb total process of traffic inbound and outbound simultaneously. Let's verify 2.

 

4) I'm not worred about the drops if iti is a busy network. Any mutlicast traffic such as lldp, cdp, stp, etc will be dropped unless the box is configured for it, which it isn't.

 

5) when looking at the captures... are there a lot of resets? Look for the longest Delta times and get a feel for what is going on.

 

6) Have you added any new iRules lately?

 

8) Are there errors on the ports (cisco or bigip)?

 

7) Why do you need this command on the switch - " flowcontrol receive desired"? You really need to know your environment if you start messing flow control, especially on gig links. I always leave everything to auto on both ends.

 

8) What LB algorith are you using on the pool?

 

 

I would take a capture but only on the most problematic VS and attempt to capture what is happening on the external and internal at the same time. Just run two tcpdumps, one for each vlan.