07-10-2008 03:51 PM - edited 03-03-2019 10:40 PM
Greetings All,
I'm scratching my head on a weird issue that I'm having. I have 2 OC3 point-to-point connection connecting site A and B. I have been transferring files from site A to B to see how much thruput is on my connection. Transfers from A to B is fine and dandy. The problem is when I transfer from B to A. The transfer from B to A is significantly (50%) slower than A to B (Same file and same servers). The weird part about this is when I disable one of my OC3's (disabled both)thruput seems to go UP. At this point I'm not quite sure where to start troubleshooting the problem.
Any insights would be appreciated
07-10-2008 04:22 PM
Are you Using Which routing protocol?
Can you observe performance by shutdown the one link completaly at both end?
Can check Duplex and speed on interfaces?
Errors?
If it is AUTO in mode duplex try to set hard set FULL bothe end?
Let me know...
Thanks,
Dharmesh Purohit
07-10-2008 04:48 PM
Are you Using Which routing protocol?
EIGRP
Can you observe performance by shutdown the one link completaly at both end?
when i shutdown one oc3 the perfomance(thruput) goes up (50%)
Can check Duplex and speed on interfaces?
Errors?
OC3
If it is AUTO in mode duplex try to set hard set FULL both end? n/a
07-10-2008 07:59 PM
Can u get the output of "sh ip cef
Rgds
07-10-2008 08:23 PM
site A
10.10.1.1/32, version 69, epoch 0, per-packet sharing
0 packets, 0 bytes
Flow: AS 0, mask 32
via 10.10.20.2, POS3/0, 0 dependencies
traffic share 1, current path
next hop 10.10.20.2, POS3/0
valid adjacency
via 10.10.30.2, POS3/1, 0 dependencies
traffic share 1
next hop 10.10.30.2, POS3/1
valid adjacency
0 packets, 0 bytes switched through the prefix
tmstats: external 0 packets, 0 bytes
internal 0 packets, 0 bytes
Site B
10.10.1.2/32, version 72, epoch 0, per-packet sharing
0 packets, 0 bytes
via 10.10.20.1, POS3/0, 0 dependencies
traffic share 1, current path
next hop 10.10.20.1, POS3/0
valid adjacency
via 10.10.30.1, POS3/1, 0 dependencies
traffic share 1
next hop 10.10.30.1, POS3/1
valid adjacency
0 packets, 0 bytes switched through the prefix
tmstats: external 0 packets, 0 bytes
internal 0 packets, 0 bytes
My endpoints (source and destination) would be a loopback IP's (10.10.1.2 (site A) & 10.10.1.1 (Site B)) on each router (l2tp)
07-10-2008 09:44 PM
you use per-packet load balancing.
So this is you problem.
use per flow load balancing.
for link utilisation per-packet load balancing is good but it's bad for TCP
with per-packet load balancing you will have much higher CPU load. Do you check CPU load on both side during a file transfer?
07-11-2008 10:46 AM
this is the cpu usage when transfering the file
Site A
show processes cpu history table
CPU utilization for five seconds: 0%/0% at 00:00:09
CPU utilization for five seconds: 0%/0% at 00:00:04
Site B
show processes cpu history table
CPU utilization for five seconds: 1%/1% at 00:00:04
CPU utilization for five seconds: 0%/0% at 00:00:09
07-11-2008 11:10 AM
As far as checking speed duplex one thing you need to remember is that if you set one end to autonegotiate and the othet at 100 Full you will experience problems. The reson is that by default when setting up auto-negotiation it defualts to 100/Half duplex.HTH
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