From: MADMAN (dmadlan@qwest.com)
Date: Thu Apr 15 2004 - 13:03:58 GMT-3
Your assuming you have a switching problem accross the trunk. Plug
host B into the 5500 and see if you still have the problem.
Dave
Minihane Kevin-kminih01 wrote:
> 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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-- David Madland CCIE# 2016 Sr. Network Engineer Qwest Communications 612-664-3367"Emotion should reflect reason not guide it"
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