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Premature bandwidth peak

Brian Easley
Occasional Visitor

Premature bandwidth peak


I am operating a hp procurve 2650 as a layer 2 switching device. Everything is working great on the device, cpu utilization is low, plenty of memory available. There are no vlans setup or any port trunking, flow control etc. I have the switch at the bare minimum config to work for this.

The uplink port is fully capable of doing 1000mbit from our upstream fiber provider. It seems the switch is somehow slowing things down, as once we reach 625mbit the bandwidth caps out and packet loss begins.

Any hints or guidance would be extremely appreciated. Here is more info from our uplink router:

no ip redirects
no ip unreachables
no ip directed-broadcast
no ip proxy-arp
negotiation auto

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex mode, link type is autonegotiation, media type is SX
output flow-control is unsupported, input flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:01, output 00:00:04, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 64864000 bits/sec, 6970 packets/sec
5 minute output rate 4167000 bits/sec, 4746 packets/sec
12262945287 packets input, 14917948021934 bytes, 0 no buffer
Received 27166 broadcasts, 0 runts, 0 giants, 0 throttles
4 input errors, 3 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 385386 multicast, 0 pause input
8545902303 packets output, 698542701059 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
6 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out