FreeBSD-8.2: Channel Bounding: LACP or Roundrobin? With Cisco Catalyst

[Denny Schierz]

hi,

I want to bound two e1000 (1Gb/s) channels and use at the moment LCAP,
but the max throughput is slower, than without channel bounding. I've
got round about 70MB/s instead of > 150MB/s - 200MB/s.

I used iperf with standard options:

:~$ iperf -f M -c 1.2.3.4
------------------------------------------------------------
Client connecting to 1.2.3.4, TCP port 5001
TCP window size: 0.02 MByte (default)
------------------------------------------------------------
[  3] local 1.2.3.5 port 58637 connected with 1.2.3.4 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec    705 MBytes  70.5 MBytes/sec

If a second PC do the same, than my 70MB/s splittet into ~30MB/s and
~40MB/s

config:

root at iscsihead-m:~# ifconfig lagg0
lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
1500

options=219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_MAGIC>
        ether 00:15:17:f1:5d:5f
        inet6 fe80::215:17ff:fef1:5d5f%lagg0 prefixlen 64 scopeid 0x5 
        inet 1.2.3.4 netmask 0xffffffc0 broadcast 1.2.3.255
        nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
        media: Ethernet autoselect
        status: active
        laggproto lacp
        laggport: em1 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
        laggport: em0 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>


Config from the Cisco:


cisco#sh run int po3
Building configuration...

Current configuration : 119 bytes
!
interface Port-channel3
 description iscsi-test
 switchport
 switchport access vlan 111
 switchport mode access
end



#sh etherchannel summary 
Flags:  D - down        P - bundled in port-channel
        I - stand-alone s - suspended
        R - Layer3      S - Layer2
        U - in use      f - failed to allocate aggregator

        M - not in use, minimum links not met
        u - unsuitable for bundling
        w - waiting to be aggregated
        d - default port


Number of channel-groups in use: 3
Number of aggregators:           3

Group  Port-channel  Protocol    Ports
------+-------------+-----------+-----------------------------------------------
1      Po1(SU)          -        Gi1/1(P)    Gi1/2(P)    
2      Po2(SU)          -        Gi6/17(P)   Gi6/18(P)   Gi6/19(P)   
3      Po3(SU)         LACP      Gi5/41(P)   Gi5/44(P)   

cisco#sh run int gi5/41
Building configuration...

Current configuration : 182 bytes
!
interface GigabitEthernet5/41
 description iscsi-head1
 switchport access vlan 111
 switchport mode access
 no cdp enable
 channel-group 3 mode active
 spanning-tree portfast
end



#sh run int gi5/44
Building configuration...

Current configuration : 183 bytes
!
interface GigabitEthernet5/44
 description GRAU1_iscsi2
 switchport access vlan 111
 switchport mode access
 no cdp enable
 channel-group 3 mode active
 spanning-tree portfast
end


#sh etherchannel load-balance 
EtherChannel Load-Balancing Configuration:
        src-dst-mac

EtherChannel Load-Balancing Addresses Used Per-Protocol:
Non-IP: Source XOR Destination MAC address
  IPv4: Source XOR Destination MAC address
  IPv6: Source XOR Destination MAC address


What I saw with tcpdump: it seems, that only one device is used.

Maybe, Cisco uses mac and FreeBSD IP ?

Any suggestions?

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