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New Member

Tx and Rx Load Too High

Hi All,

I am facing a strange problem in my network. For WAN connectivity we are using 64 Kbps LL connected via serial link, the Tx and Rx load in the Serial interface is increasing drastically, even when there is no traffic flow or minimum traffic flow.

The strange thing is if I shut the Fast Ethernet port in the remote end, the Tx and Rx load in the near end serial interface increases suddenly and reaches up to txload 227/255 and rxload 227/255.

Need ur help in resolving the issue at the earliest.

Thanks in Advance.

Vasu

12 REPLIES

Re: Tx and Rx Load Too High

Vasu,

You may want to enable netflow on the interface ingress and egress to see what's coming in and out of the network.

HTH,

John

HTH, John *** Please rate all useful posts ***
New Member

Re: Tx and Rx Load Too High

John,

Thanks for ur reply. Can u explain me in detail, what steps I need to take?

Vasu.

Re: Tx and Rx Load Too High

Vasu,

You can try:

Router(config)#ip flow-top-talkers

Router(config-flow-top-talkers)#top 10

Router(config-flow-top-talkers)#sort-by bytes

Router(config-flow-top-talkers)#

Router(config)#int g0/1

Router(config-if)#ip route-cache flow

To show the top talkers:

Router# sh ip flow top-talkers

The top traffic generators will be listed at the top.

HTH,

John

HTH, John *** Please rate all useful posts ***
New Member

Re: Tx and Rx Load Too High

John,

I didn't see this message earlier. I will try this and share the output.

Thanks for ur help.

Vasu.

New Member

Re: Tx and Rx Load Too High

John,

In my router, ip flow-top-talkers is not supported. Any other option?

Vasu

New Member

Re: Tx and Rx Load Too High

Can we see a "show int" on the serial and a "sh run int" on that as well?

New Member

Re: Tx and Rx Load Too High

Rock,

I am pasting the Show run int and show int output.

sh run int se1/0:30

!

interface Serial1/0:30

description xxxx

ip address x.x.x.x x.x.x.x

encapsulation ppp

ppp authentication chap

end

sh int se1/0:30

Serial1/0:30 is up, line protocol is up

Hardware is M32X with CSU/DSU

Description: ***

Internet address is x.x.x.x/30

MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec,

reliability 255/255, txload 227/255, rxload 227/255

Encapsulation PPP, LCP Open

Listen: CDPCP

Open: IPCP, loopback not set

Keepalive set (10 sec)

Last input 00:00:00, output 00:00:00, output hang never

Last clearing of "show interface" counters 02:35:07

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 392

Queueing strategy: weighted fair

Output queue: 0/1000/64/392 (size/max total/threshold/drops)

Conversations 0/187/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 48 kilobits/sec

5 minute input rate 57000 bits/sec, 107 packets/sec

5 minute output rate 57000 bits/sec, 107 packets/sec

142081 packets input, 8931367 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

141756 packets output, 8874954 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions

Timeslot(s) Used:31, Transmitter delay is 0 flags

Re: Tx and Rx Load Too High

Vasu,

Something is using 57k of your 64k line. The netflow will help.

John

HTH, John *** Please rate all useful posts ***
New Member

Re: Tx and Rx Load Too High

John,

ip flow-top-talkers is not supported in my router. Any alternate command?

Vasu

Re: Tx and Rx Load Too High

What router do you have?

HTH, John *** Please rate all useful posts ***
New Member

Re: Tx and Rx Load Too High

John,

Router model is 3845 and the IOS version is c3845-advipservicesk9-mz.124-15.XZ.bin

Vasu

Re: Tx and Rx Load Too High

Vasu,

I'll take your word for it. I would've thought netflow would've been in that image, but I don't have that particular image to test.

Looks like you'd need:

12.4(25) c3845-advipservicesk9-mz.124-25.bin

to be able to support netflow.

Other than having a sniffer, I can't think of any other way you can configure anything on the router that would show you the traffic.

John

HTH, John *** Please rate all useful posts ***
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