Hi, all: I want to manage VLAN between two NetFPGA (or more after I solve problems) by NOX Controller. I grep the keywords "VLAN" and "vlan" recursively in "src/" directory and found that there are no example which handling VLAN. And I lose any information?
So I try to write a simple VLAN handling script. My testing topology is simple: PC 1: MAC Addr: 00:16:d3:c8:4f:d4 , IP Addr: 192.168.1.1 PC 2: MAC Addr: 00:0f:b0:df:38:18 , IP Addr: 192.168.1.2 OF Switch 1: DP: 336185131409 (00:4e:46:32:01:91) OF Switch 2: DP: 336185131393 (00:4e:46:32:01:81) Link topology: | PC1 | -------- | Port 1 | OF 1 | Port 0 | --------[VLAN ID = 2]-------- | Port 2 | OF 2 | Port 3 |-------- | PC 2 | I want to add VLAN between OF 1 and OF 2. My idea is: 1. Add VLAN Header when packet arrive OF 1 and its source MAC is PC 1. 2. Strip VLAN Header when packet arrive OF 2 and its destination MAC is PC 2. Then I modified pyswitch.py in "src/nox/coreapps/examples/" and add some codes in forward_l2_packet function: http://pastebin.com/GrfNyFLN It works but in a strange way. PC 1 could send ICMP Request to PC 2 and receive ICMP Reply from PC2, and vice versa. I check the flow tables in OF 1 and OF 2, there is a flow entry with "actions=mod_vlan_vid:2,mod_vlan_pcp:1,output:0" and "dl_vlan=0xffff" in OF 1, but there are no related flow entries in OF 2. Is there any mistake because of my misunderstanding? Because there is no flow entries in OF 2, OF 2 will send every packet to NOX. And NOX will send "strip VLAN header" command to OF 2 every time. Another problem is that 10 seconds after PC 1 send ARP Request/Reply to PC 2, learning switch will forget the normal flow. Then NOX will flood packets in OF 2 until receive next ARP Request/Reply. It seems that if packets with VLAN header, it cannot learned by do_l2_learning function? One of packets: [00:16:d3:c8:4f:d4->00:0f:b0:df:38:18=VLAN](vlanid=2)[IP]([v:4 hl:5 l:60 t:128] ICMP cs:88f9[192.168.1.1>192.168.1.2]){t:8 c:0 csum: 0xc469}{icmp id:2 seq:35056} I tried to explain my problem clearly. Thanks for reading and replying in advance! Wen-Pei
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