NIC Bonding And Switches
Jul 2, 2008
I just stumbled across mention of bonding two NICs to serve as one. (E.g., 100Mbps NIC + 100Mbps NIC = 'virtual' 200 Mbps NIC, as far as everything on the network is concerned.)
I'd been familiar with the concept for quite some time, but I guess I never really thought it through until just now...
How does this work with switches? It seems to me that the answer should be a flat, "It doesn't." But it seems that it does work. How does the switch merrily map an IP to two different ports? Do the two NICs maintain their MACs? (Wouldn't two MACs to one IP cause even more problems?)
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Oct 25, 2009
I am thinking of bonding several ADSL connections at my house in order to get a faster upload speed to my servers.
Does anyone know of any good routers out there that could do this job (Cisco or HP would be preferred, but any brand is okay)?
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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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Nov 23, 2007
I am building an advanced network in a big building which will be used by desktop/printers and backend thin servers, which requires high-available network and consume high bandwidth all this thru categorie 6 cables (RJ-45).
The idea is to build different path with optical fibers and to connect each part of the building with it's own optical fiber to the server room (where we run Microsoft company network servers, SAN, backup, and external access) using a 10/100/1000 switch and optical fiber for long distance.
So I though about using switches which have at least :
48 ports 10/100/1000 (auto negociation)
4 ports 10 gE
for now I will not use many features but with time I could create some trunk, and use some advanced *routing* (switching) features.
As the budget is also not unlimited, I thought about buying :
Edge switch :
§ HP ProCurve 2900-48G J9050A [url]
with X2 extension HP ProCurve 10-GbE X2-SC SR Optic J8436A [url]
Core switch :
§ HP ProCurve 6400cl J8433A [url]
As I am studying any network vendor (but not such as 3com, netgear, dlink, linksys), but more such as HP, Extreme, Cisco, Foundry I am opended to your model ideas for me needs!
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Apr 1, 2007
I am in the market for some new switches and I was going to buy some HP stuff, but a friend of mine recommended 3com....their prices are dirt cheap....any experience with them?
Does anyone have any words to compare and contrast the two based on experience?
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Sep 12, 2007
to buy some more Layer 3 switches but I'd like to get ipv6 support. I like the Cisco 3550 but it does not support ipv6.
Can someone recommend a switch in the same price range (less than $1400 for 48 ports) that supports ipv6? This will be used for connecting to customer servers.
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Jun 19, 2007
Is there such a switch?
Do cisco do a 24 port 1000Mbs switch that you can control each port speed through a web based software?
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Dec 25, 2007
where I can get the best price for HP switches? Looking for 1x2848 and 1x2650
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Aug 9, 2009
we are a small shop...
Not looking to buy another switch but we have a crapshoot of switches around. Dell 5448,
HP 2910 and a Cisco 3560.
I'd like to keep the the Cisco back in HQ stock since it's a POE switch.
We are colocating just 1 SAN intially. Max of maybe 7-8 Servers total in the future. Not alot of bandwidth and doing L2 traffic only. Any issues with either the Dell or HP in the colo environment from a production standpoint. We have used a couple of Procurves in our environment, and the dell switches were freebies that were part of our last order.
Basically, it would look like this
ASA5510 serving as main headed VPN
2 Branch Offices connecting to it
One L2 Switch. 2 - 3 Seperate Vlans with a trunk port back out to the ASA5510
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Jun 28, 2008
basic layer2 10G, most everything out there has more advanced L3 features which is fine but aren't nessecary, they maybe used at some point in the future.
Currently looking at the cisco 4900M as it appears to be very cost effective at ~$10k/ for the chassis w/8 port 10gb base, + xenpack cost and it isn't a very costly piece of gear.
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Apr 29, 2008
Does anyone use Dell PowerConnect Switches?
If so please list what model number you use and your thoughts as compared to Cisco switches.
Once again I would like model numbers you are using.
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Feb 22, 2007
We're ready to setup 3-4 42U racks for servers and are in need of choosing Ethernet switches. What do you guys use and why?
I'm looked at Cisco switches, but lost in their product forest. I'm looked at Express 500, 2960 and 3750-E models. Is there any more difference (in exception of stacking, cli and hot-swap fan/psu) that I need to consider? Prices differentiate too much.
I'm also looked at Linksys/D-Link business products and they seems to have the same features as Cisco Express series, but only 50% cheaper.
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Mar 5, 2007
I had the chance to work with the summit24 switches, and I personally liked them. It is straight-forward in my opinion for the Web Interface compared to others I have seen and the pricing seems to be reasonable.
I was wondering if anyone has had any experience with any of their switching devices.
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Jun 9, 2008
I was checking out the switch products from Cisco and I noticed that there is quite a few products that been discounted, and I am trying to find correct switches that does traffic shaping on port for inbound and outbound.
I preferred they are 48 ports with 2 Gigabit uplinks, with Enterprise L3 image and it is little difficult to find the correct older models that is being sold on ebay to pick up the correct one.
I am also open to Extreme and Foundry switches as well, but I rather like to stick to one type for deployment, since I am working on the plan to deploy 2 core switches which all edge switches will hook into it.
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Jan 26, 2007
I current do some rsync backups with a command like so every day
rsync -az -e ssh --stats --delete --exclude "stuff" / user@server:/home/user/
What I want to do is have some incremental backups in there in subdirectories. So, for example, something like this on the remote server
/home/user/something.tuesday
/home/user/something.friday
I thought the --backup --backup-dir Switches were used to store just the files that had changed in seperate directories, am I wrong on that?
I've read everything I could find, including the big rsnapshot scripts, but I'm not able to do what I want, it seems so simple but something's not right, am I wrong that subdirs should have just files that are new or have changed. I tried various things like this, but had no luck
rsync -az -e ssh --stats --delete --backup --backup-dir=/home.Thursday --exclude "stuff" / user@server:/home/user/
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