Hi, I am trying to configure LAG between SG-250-08 and C3560CG-8PC with the following topography:
+----+ +----+
|SRV1| |SRV2|
+--+-+ +-+--+
GbE | | GbE
| |
+--+-------+--+
| C3560CG-8PC |
+-----+-+-----+
| | 2xGbE LAG
| |
+-----+-+-----+
| SG-250-08 |
+--+--------+-+
GbE | | GbE
| |
+--+-+ +--+-+
| PC1| |PC2 |
+----+ +----+ The Cisco devices are connected with two cat6e cables, both devices have LAG configured and enabled, so the resulting channel should have a total bandwidth of 2Gbit.
I am testing the bandwidth between the following pairs using iperf: PC1 <=> SRV1 and PC2 <=> SRV2
According to my understanding of LAG, I should be able to see 1Gb between each pair.
Instead I see both pairs sharing 1Gb (500/500 Mbit roughly).
Here's the config for C3560CG-8PC
interface GigabitEthernet0/1
switchport mode access
switchport access vlan 1
channel-group 1 mode active
!
interface GigabitEthernet0/2
switchport mode access
switchport access vlan 1
channel-group 1 mode active
!
interface Port-Channel1
description UPLINK
port-channel load-balance src-dst-mac
Port channel info
show interface po1
Port-channel1 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 80e8.6fe6.2d81 (bia 80e8.6fe6.2d81)
Description: UPLINK
MTU 1500 bytes, BW 2000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 7/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, link type is auto, media type is unknown
input flow-control is off, output flow-control is unsupported
Members in this channel: Gi0/1 Gi0/2
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:01, output 00:03:17, output hang never
Last clearing of "show interface" counters never
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 56896000 bits/sec, 4682 packets/sec
5 minute output rate 293000 bits/sec, 527 packets/sec
2121328 packets input, 3219002211 bytes, 0 no buffer
Received 242 broadcasts (236 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 236 multicast, 0 pause input
0 input packets with dribble condition detected
240329 packets output, 16977081 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 unknown protocol drops
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
show etherchannel load-balance
EtherChannel Load-Balancing Configuration:
src-dst-macshow lacp nei
Flags: S - Device is requesting Slow LACPDUs
F - Device is requesting Fast LACPDUs
A - Device is in Active mode P - Device is in Passive mode
Channel group 1 neighbors
Partner's information:
LACP port Admin Oper Port Port
Port Flags Priority Dev ID Age key Key Number State
Gi0/1 SA 1 a4b4.39bc.dde5 13s 0x0 0x3E8 0x8 0x3D
Gi0/2 SA 1 a4b4.39bc.dde5 23s 0x0 0x3E8 0x7 0x3D
And for SG-250-08
interface GigabitEthernet7
channel-group 1 mode auto
!
interface GigabitEthernet8
channel-group 1 mode auto
!
interface Port-Channel1
flowcontrol on
description UPLINK
port-channel load-balance src-dst-mac
Port channel info
#show interface po1
Load balancing: src-dst-mac.
Gathering information...
Channel Ports
------- -----
Po1 Active: gi7-8
I tried with LACP enabled/disabled, same result.
When testing I see the LEDs on both ports blinking.
I just don't understand what I am doing wrong.
