Colo Link Aggregation / 802.3ad Alternatives
Apr 28, 2008
I run a small streaming/cdn service and I'm looking at how best to utilize my bandwidth. Here's the scoop:
I have a 1/4 rack and 2 gbit drops from my provider. Currently I am running a single server connected to 1 gbit port - nothing fancy. Business is good so I am about to add another server. As this location is already the backup/failover for my primary colo (different location/provider), I am interested in playing with aggregation options.
I have used 802.3ad in the past, so that was my first choice. I asked my provider if they can trunk my ports on their switch - unfortunately they refused (they only allow it above a certain commit).
So...do I have any other options for aggregation? It's pure mb/sec throughput that I am looking for, rather than failover. I have the rackspace/power/etc to colo my own switch or router, I'm just curious if there is an effective alternative.
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Aug 14, 2009
I thought with 802.3ad I could aggregate the links and thus turn a 3x100 megabit pipes to one 300 meg pipe. The problem is when using the default options (and layer2 xmit mode) I only get the bandwidth of a single connection and I see no other traffic on the other two. Here is output from /proc/net/bonding/bond0:
Code:
Ethernet Channel Bonding Driver: v3.3.0 (June 10, 2008)
Bonding Mode: IEEE 802.3ad Dynamic link aggregation
Transmit Hash Policy: layer2 (0)
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0
802.3ad info
LACP rate: slow
Active Aggregator Info:
Aggregator ID: 2
Number of ports: 3
Actor Key: 9
Partner Key: 3
Partner Mac Address: 00:1e:f6:xx:xx:xx
Slave Interface: eth0
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:1e:8c:xx:xx:xx
Aggregator ID: 1
Slave Interface: eth2
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:04:23:xx:xx:xx
Aggregator ID: 1
Slave Interface: eth3
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:04:23:xx:xx:xx
Aggregator ID: 1
Basically it works in that I get a connection but its no different from being on a regular 100/100 connection. Downloading files my machine from completely different networks always only goes out one connection. I don't even see any received/sent packets from the other two interfaces.
When I tell it to use layer3+4 via the xmit_hash_policy paramter when loading the module IE:
modprobe bonding mode=4 xmit_hash_policy=layer3+4 miimon=100
It seems to work as expected except it looks like all incomming traffic comes in on the same interface and its not much different from a normal load balancing (except from a single IP address). I will stick to this method if I have no choice as I don't really care about the download all that much and it seems to do a good job.
Here is /proc/net/bonding/bond0 from that config:
Code:
Ethernet Channel Bonding Driver: v3.3.0 (June 10, 2008)
Bonding Mode: IEEE 802.3ad Dynamic link aggregation
Transmit Hash Policy: layer3+4 (1)
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0
802.3ad info
LACP rate: slow
Active Aggregator Info:
Aggregator ID: 2
Number of ports: 3
Actor Key: 9
Partner Key: 3
Partner Mac Address: 00:1e:f6:xx:xx:xx
Slave Interface: eth0
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:1e:8c:xx:xx:xx
Aggregator ID: 2
Slave Interface: eth2
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:04:23:xx:xx:xx
Aggregator ID: 2
Slave Interface: eth3
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:04:23:xx:xx:xx
Aggregator ID: 2
My understanding is that with layer2 it should just be one big fat pipe. IE: packets are fragmented and thus even a single connection should be able to sustain 300 megabits (if the other end could provide it). It seems like it just doesn't use my other interfaces at all when doing this.
Here is my config on the cisco 2960:
Code:
interface Port-channel3
switchport access vlan 100
switchport trunk allowed vlan 100
switchport mode access
switchport nonegotiate
spanning-tree portfast
!
interface FastEthernet0/10
switchport access vlan 100
switchport trunk allowed vlan 100
switchport mode access
switchport nonegotiate
channel-protocol lacp
channel-group 3 mode active
spanning-tree portfast
!
interface FastEthernet0/38
switchport access vlan 100
switchport trunk allowed vlan 100
switchport mode access
switchport nonegotiate
channel-protocol lacp
channel-group 3 mode active
spanning-tree portfast
!
interface FastEthernet0/40
switchport access vlan 100
switchport trunk allowed vlan 100
switchport mode access
switchport nonegotiate
channel-protocol lacp
channel-group 3 mode active
spanning-tree portfast
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