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New Member

Ethernet interface

Anyone got an idea on how to troubleshoot

%AMDP2_FE-5-LATECOLL: Ethernet1/0 transmit error. This interface connects ot a speedstream modem which, in turns connect to a DSL connection.

ROUTER(config)#do sh run int ethernet 1/0

Building configuration...

Current configuration : 195 bytes

!

interface Ethernet1/0

description MTS_DSL

no ip address

no ip redirects

no ip unreachables

no ip proxy-arp

half-duplex

pppoe enable

pppoe-client dial-pool-number 1

no mop enabled

end

ROUTER(config)#do sh int ethernet 1/0

Ethernet1/0 is up, line protocol is up

Hardware is AmdP2, address is 000d.bd15.c610 (bia 000d.bd15.c610)

Description: MTS_DSL

MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

ARP type: ARPA, ARP Timeout 04:00:00

Last input 04:26:06, output 00:00:04, output hang never

Last clearing of "show interface" counters 03:28:05

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

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

4127 packets input, 907021 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 input packets with dribble condition detected

5856 packets output, 1367989 bytes, 0 underruns

18 output errors, 16 collisions, 9 interface resets

0 babbles, 15 late collision, 22 deferred

3 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

6 REPLIES
New Member

Re: Ethernet interface

Does pppoe have an overhead of 8? So doesnt the MTU need to be lowered?

New Member

Re: Ethernet interface

Thanks for your response.

I tried doing that.

ROUTER(config-if)#mtu 1492

% Interface Ethernet1/0 does not support user settable mtu.

Also the MTU on Dialer 1 interface is set to 1492

interface Dialer1

ip address negotiated

no ip redirects

no ip unreachables

no ip proxy-arp

ip mtu 1492

ip nat outside

ip virtual-reassembly

encapsulation ppp

no ip mroute-cache

dialer pool 1

dialer-group 1

ppp authentication chap callin

ppp chap hostname XXXXX

ppp chap password XXXXX

Hall of Fame Super Silver

Re: Ethernet interface

Ojasvi

A late collision is a classic symptom of duplex mismatch. Your interface is hard set to half duplex. I suspect that is you check the speedstream is probably set for full duplex.

If one device has its duplex hard set then both devices on a connection need to have duplex hard set and they need to be set the same. I believe that if you set this interface for full duplex that the errors will stop (and performance will probably improve).

HTH

Rick

New Member

Re: Ethernet interface

Hey Rick,

Thanks for the response. I tried using Full-duplex as well. When I use Full-duplex input errors increase tremendously. When I use half-duplex output errors occur.

Since the modem belongs to the ISP, it is not gonna allow me to change anything on the modem.

Any tweaking that we can do on the router?

Thanks very much

OJ

New Member

Re: Ethernet interface

I think the service you have from the provider is half-duplex. Check with your subscriber whether they have given you modem that works only on half-duplex. We have a similar issue with one of our clients.

New Member

Re: Ethernet interface

I think the service you have from the provider is half-duplex. Check with your subscriber whether they have given you modem that works only on half-duplex. We have a similar issue with one of our clients. I don't think you can do anything on the router side. Its not a problem at router end.

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