Responses inline. On Dec 5, 2011, at 6:42 PM, 王健 wrote:
> Hi Murphy: > I am confused about a question about OpenFlow dedicated switch for a long > time.The following is my testing network topology: > <截图4.png> > PC1 and PC2 can ping each other successfully if they have the same net id, > and can't ping successfully if they don't. I assume you mean if they're on the same subnet? > Does OpenFlow dedicated switch only surpport layer 2 processing when run the > command : nox_core -v -i ptcp:6633 discovery topology authenticator routing? Well, routing tries to install exact match flows whenever possible, if I recall correctly. This includes L3 headers too when possible. But it's not exactly L3 *processing*. > I think it has no ability of forwarding if disconnects to NOX. There are things that can be done to help with communication when NOX is disconnected, but none of them are done here. Certainly the usual model is that your controller stays connected to your switches. > I just want to know how to achieve layer 3 processing with OpenFlow dedicated > switch and NOX. Would you please help me even some advice,thank you very much~ What kind of layer 3 processing are you talking about? > Another question,how to make the topo update timely which you can see from > NOX GUI , the topo can display the whole network topo when run the command: > ./nox_core monitoring discovery topology trackhost_pktin. But it can't update > timely when a host leave from the network. How to solve this problem? I am > sorry to post it again as the question may be overloaded. Thank you~ Well, there's no real way to tell when a host leaves. So right now, it's decided by timeout. You could try reducing the timeout, but that increases the chance that a quiet host may be judged to be leaving when it's actually just quiet. I have suggested that we ARP-ping hosts occasionally to see if they're still there or not. If a host NEVER responds to an ARP-ping, fall back to the timeout behavior. This hasn't yet been implemented, though, as far as I know. > By the way, i have solved the disconnecting problem via adding a 1G > ethernet switch beween them yesterday.Because the netfpga only surpports 1G > transporting speed,but the max speed which the openwrt surpports is 100M. > Best Wishes > > Wang Jian > > Tuesday, December 6,2011 -- Murphy
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