01-26-2009 05:51 PM - edited 03-06-2019 03:40 AM
layout:.
server1---dell-Switch---Cisco4948---Server2
dot1q trunking setup between dell and cisco.
Trunk set to on.
Etherchannel between dell and cisco. Set to
lcap.
------------ connection to dell switch
interface GigabitEthernet1/2
switchport trunk encapsulation dot1q
switchport mode trunk
channel-protocol lacp
channel-group 2 mode active
-------------------
interface Port-channel2
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
-----------------------
show etherchannel summary
Po2(SU) LACP Gi1/2
now when I set server1 to be on native vlan 1
(no tagging)
I can ping server 2 with packet size 1500
When server2 is set to other vlan, maximum packet size that i can get is 1496. If set ping to send 1497byte packets i do not get icmp' back.
Now i create new port-channel on cat 4948. Ch5
Po5(SU) LACP 18(P)
sh run
Gi1/interface Port-channel5
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
-------------
interface GigabitEthernet1/18
switchport trunk encapsulation dot1q
switchport mode trunk
channel-protocol lacp
channel-group 5 mode active
I create the new port g1/18 exactly as the gi 1/2.
pull the cable from gi1/2 plug in into 1/18
do a ping test with 1500bytes packet. Works great.
I do not see any difference between those two ports. trunking setting are all the same. but something is wrong with gi1/2. I checked counters no errors.
I believe there has to be something wrong with gi1/2 interface but i cannot find out what.
01-26-2009 08:31 PM
Hi
I need more info
etherchannel between cisco dell switch:
for example ports on dell switch and ports on cisco switch, configurations on both switches.
Connection between dell switch and server 1:
ports on each and their configurations
connection between cisco switch and sever 2:
ports on each and their configuration
Thanks a lot!
01-27-2009 06:18 AM
Here is sh run from dell PowerEdge 5316
server is on g1
etherchannel to cisco is on g12-16
====================
interface ethernet g1
spanning-tree portfast
interface port-channel 1
switchport mode trunk
interface range ethernet g(12-16)
switchport mode trunk
interface port-channel 1
switchport trunk allowed vlan add 10
interface port-channel 1
switchport trunk allowed vlan add 50
interface ethernet g1
switchport access vlan 10
port-channel load-balance layer-2-3
interface range ethernet g(12-16)
channel-group 1 mode auto
---------------------
Now on cat4948 I have 5 channels.
Only channel 2 is bad. that is where dell switch was connected before.
Now i moved dell switch to channel 5.
Channel 2 port is down also, since i moved dell to channel 5
--------------------
Group Port-channel Protocol Ports
------+-------------+-----------+-----------
2 Po2(SD) LACP Gi1/2(D)
5 Po5(SU) LACP Gi1/18(P) Gi1/19(P) Gi1/20(P)
---------------------------------
sh run (cat4948 for channels 2 and 5)
interface Port-channel2
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface Port-channel5
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface GigabitEthernet1/2
switchport trunk encapsulation dot1q
switchport mode trunk
channel-protocol lacp
channel-group 2 mode active
!
interface GigabitEthernet1/18
switchport trunk encapsulation dot1q
switchport mode trunk
channel-protocol lacp
channel-group 5 mode active
!
========================
sh int port-channel 2
Port-channel2 is down, line protocol is down (notconnect)
Hardware is EtherChannel, address is 0000.0000.0000 (bia 0000.0000.0000)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto-speed, media type is N/A
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 14:07:12, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
sh int port-channel 5
Port-channel5 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 0021.d880.7713 (bia 0021.d880.7713)
MTU 1500 bytes, BW 3000000 Kbit, DLY 10 usec,
reliability 255/255, txload 2/255, rxload 24/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is N/A
input flow-control is off, output flow-control is unsupported
Members in this channel: Gi1/18 Gi1/19 Gi1/20
ARP type: ARPA, ARP Timeout 04:00:00
Last input 14:05:11, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 285173000 bits/sec, 31512 packets/sec
5 minute output rate 32298000 bits/sec, 17549 packets/sec
==================================
sh int gi 1/2
show interfaces gigabitEthernet 1/2
GigabitEthernet1/2 is down, line protocol is down (notconnect)
Hardware is Gigabit Ethernet Port, address is 0021.d880.7701 (bia
0021.d880.7701)
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)
Auto-duplex, Auto-speed, link type is auto, media type is 10/100/1000-TX
input flow-control is off, output flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input 14:07:16, output never, output hang never
Last clearing of "show interface" counters
01-27-2009 07:45 AM
Hello Mariusz,
a difference of four bytes in the two directions is exactly the size of the 802.1Q header and makes to think someone is tagging native vlan unexpectedly.
Another possibility is that the problem was caused by the sequence of commands used to build the second port-channel.
Like for example you had before an access layer bundle and then you changed it to a trunk link.
Is port-channel 5 now connected to dell switch working well ?
Hope to help
Giuseppe
01-27-2009 09:17 AM
yes channel 5 is working great. no problems
I also suspect incorrect command sequence, because none of the ports that belong to channel2 (non working channel) had problems trunking. (gi 1 - 5)
So now i tried to clear all the settings from Gi 1/1 - 5 and run no interface port-channel 2 command.
However when I recreated port channel again using the same ports. it is still having the same problem. I am wondering now if i have to reset somehow those ports or do something else to really remove port-channel 2 from the switch
01-27-2009 01:04 PM
i setup plain trunk between two cisco sw.
forget dell.
to do that I have used one of the ports that were bad.
Trunk still not working but i have some more info.
sw1 (good cisco switch no issues with trunking)
show platform hardware interface gigabitEthernet 1/1 statistic
Switch Phyport Gi1/1 Non-Zero Hardware Statistics
RxDot1qTaggedPackets : 1411705
TxDot1qTaggedPackets : 11150
RxIslTaggedPackets : 6
RxIpHeaderGoodPackets : 2049523
TxBytesQueue0 : 48424
TxBytesQueue1 : 890526
TxBytesQueue3 : 367961
Gigaport41(Gi1/1) Non-Zero Hardware Statistics
RxPackets64 : 54941
TxPackets64 : 347
RxPackets65to127 : 614705
TxPackets65to127 : 10537
RxPackets128to255 : 23110
TxPackets128to255 : 678
RxPackets256to511 : 342100
TxPackets256to511 : 332
RxPackets512to1023 : 194086
TxPackets512to1023 : 111
RxPackets1024to1518 : 1137677
TxPackets1024to1518 : 61
RxPackets1519to1548 : 2576
TxPackets1519to1548 : 100
RxMcastPackets : 528679
TxMcastPackets : 9561
RxUcastPackets : 6093
TxUcastPackets : 2585
RxBcastPackets : 1834423
TxBcastPackets : 20
RxGoodBytes : 1910203800
switch with broken trunking on one interface
show platform hardware interface gigabitEthernet 1/2 statistics
Switch Phyport Gi1/2 Non-Zero Hardware Statistics
TxDot1qTaggedPackets : 179119169
RxIslTaggedPackets : 152
RxIpHeaderGoodPackets : 3309518049
TxBytesQueue0 : 18323748
TxBytesQueue1 : 103671389
TxBytesQueue2 : 293
TxBytesQueue3 : 1003257000
Gigaport40(Gi1/2) Non-Zero Hardware Statistics
RxPackets64 : 2935954
TxPackets64 : 13764264
RxPackets65to127 : 2482336432
TxPackets65to127 : 4141905070
RxPackets128to255 : 175226843
TxPackets128to255 : 391477450
RxPackets256to511 : 276128267
TxPackets256to511 : 1976534223
RxPackets512to1023 : 158339447
TxPackets512to1023 : 1596983340
RxPackets1024to1518 : 216580464
TxPackets1024to1518 : 2545732621
TxPackets1519to1548 : 396214
RxMcastPackets : 265428
TxMcastPackets : 4020304
RxUcastPackets : 3311279034
TxUcastPackets : 1834793543
RxBcastPackets : 2945
TxBcastPackets : 238044743
RxOversizedPackets : 300
RxGoodBytes : 2586157299
RxErrorBytes : 456516
Notice that there is no stats for RxDot1qTaggedPackets here
unlike on sw1 that has both counters.
Also,second switch says RxOversizedPackets 300.
now when I ping a serveri(ping -M do -s 1469) in non native vlan that is connected to sw1
that counter is increasing.
So it looks like when this port receives full dot1q tagged frame it does not
know what to do with it and thinks that it is oversized.
It cannot recognize that this is tagged frame.
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