From: Minihane Kevin-kminih01 (Kevin.Minihane@motorola.com)
Date: Thu Apr 15 2004 - 12:42:57 GMT-3
Hi
Apologies in advance if this seems long winded, but I wanted to attach the configurations, and output of various commands.
I'm experiencing a very strange trunking issue, and was wondering if anyone could perhaps have some input which might help?
The following is my layout.
Host A ------- Cat5500 ------------------------------ Cat3550 ------------ Host B
Each host is connected to it's switch using a 100Mb full duplex connection
I have two switches (cat 5500 running CatOS, and a 3550). I'm trunking between both using dot1q encapsulation. Vtp information is flowing freely between them, and I can configure vlans on both, propagate the vlans between each switch, etc. The trunk between the switches is a gigabit fibre connection.
The problem I am having is when I try to ftp from host A to host B, and vice versa.
If I ftp from Host A to Host B, I experience very slow speeds (sometimes as low as 24k per second). If I come from Host B to host A, the speed increases to 8Mbs per second! I've checked the usual (speed, duplex, check for CRC, dropped packets) and I get nothing
The following is the config of the interface g0/1 on the 3550
Lab_3550_1#show run int g0/1
Building configuration...
Current configuration : 169 bytes
!
interface GigabitEthernet0/1
description Trunk to main lab 5500 port 1/1
switchport trunk encapsulation dot1q
switchport mode dynamic desirable
no ip address
end
This is the output when I type the "show int g0/1" command on the 3550
Lab_3550_1#show int g0/1
GigabitEthernet0/1 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 000d.bc49.44b1 (bia 000d.bc49.44b1)
Description: Trunk to main lab 5500 port 1/1
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, link type is auto, media type is SX
output flow-control is off, input flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 01:52:54
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 1962000 bits/sec, 471 packets/sec
5 minute output rate 1707000 bits/sec, 428 packets/sec
2818750 packets input, 1023156797 bytes, 0 no buffer
Received 293096 broadcasts (0 multicast)
0 runts, 0 giants, 0 throttles
1 input errors, 1 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 224737 multicast, 0 pause input
0 input packets with dribble condition detected
2635991 packets output, 1397912368 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
And finally, on the 3550, I "show int trunk"
Lab_3550_1#show int trunk
Port Mode Encapsulation Status Native vlan
Fa0/45 desirable isl trunking 44
Fa0/46 desirable isl trunking 44
Fa0/47 on isl trunking 41
Gi0/1 desirable 802.1q trunking 1
Gi0/2 desirable 802.1q trunking 41
Port Vlans allowed on trunk
Fa0/45 1-4094
Fa0/46 1-4094
Fa0/47 1-4094
Gi0/1 1-4094
Gi0/2 1-4094
Port Vlans allowed and active in management domain
Fa0/45 1,10,12,20,25,28,30-33,35-41,44-45,48,52,54-55,60,130,341,351-352,361,369,400-406,419,995
Fa0/46 1,10,12,20,25,28,30-33,35-41,44-45,48,52,54-55,60,130,341,351-352,361,369,400-406,419,995
Fa0/47 1,10,12,20,25,28,30-33,35-41,44-45,48,52,54-55,60,130,341,351-352,361,369,400-406,419,995
Gi0/1 1,10,12,20,25,28,30-33,35-41,44-45,48,52,54-55,60,130,341,351-352,361,369,400-406,419,995
Gi0/2 1,10,12,20,25,28,30-33,35-41,44-45,48,52,54-55,60,130,341,351-352,361,369,400-406,419,995
Port Vlans in spanning tree forwarding state and not pruned
Fa0/45 1,41,44,351,361,400
Fa0/46 1
Fa0/47 1,10,12,20,25,28,30-33,35-41,44-45,48,52,54-55,60,130,341,351-352,361,369,400-406,419,995
Gi0/1 1,10,12,20,25,28,30-33,35-41,44-45,48,52,54-55,60,130,341,351-352,361,369,400-406,419,995
Gi0/2 1,41,403-406
On my 5500 I do the following:
5500-OMCLAB (enable) show port capabilities 1/1
Model WS-X5530
Port 1/1
Type 1000BaseSX
Speed 1000
Duplex full
Trunk encap type 802.1Q,ISL
Trunk mode on,off,desirable,auto,nonegotiate
Channel no
Broadcast suppression percentage(0-100)
Flow control receive-(off,on,desired),send-(off,on,desired)
Security no
Membership static
Fast start yes
QOS n/a
Rewrite no
UDLD Capable
5500-OMCLAB (enable) show port 1/1
Port Name Status Vlan Level Duplex Speed Type
----- ------------------ ---------- ---------- ------ ------ ----- ------------
1/1 Trunk to lab_3550_ connected trunk normal full 1000 1000BaseSX
Port Trap IfIndex
----- -------- -------
1/1 disabled 224
Port Broadcast-Limit Broadcast-Drop
-------- --------------- --------------
1/1 - 0
Port Send FlowControl Receive FlowControl RxPause TxPause Unsupported
admin oper admin oper opcodes
----- -------- -------- -------- -------- ------- ------- -----------
1/1 desired off off off 0 0 0
Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize
----- ---------- ---------- ---------- ---------- ---------
1/1 0 0 0 0 0
Port Single-Col Multi-Coll Late-Coll Excess-Col Carri-Sen Runts Giants
----- ---------- ---------- ---------- ---------- --------- --------- ---------
1/1 0 0 0 0 0 0 -
Last-Time-Cleared
--------------------------
Thu Apr 15 2004, 10:04:41
5500-OMCLAB (enable) show trunk
Port Mode Encapsulation Status Native vlan
-------- ----------- ------------- ------------ -----------
1/1 on dot1q trunking 1
1/2 on dot1q trunking 1
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