{"id":847,"date":"2014-01-06T20:34:00","date_gmt":"2014-01-06T12:34:00","guid":{"rendered":"http:\/\/note.systw.net\/note\/?p=847"},"modified":"2023-11-06T20:49:41","modified_gmt":"2023-11-06T12:49:41","slug":"openflow","status":"publish","type":"post","link":"https:\/\/systw.net\/note\/archives\/847","title":{"rendered":"Openflow"},"content":{"rendered":"\n

openflow 1.0
\u88ab\u5c01\u88dd\u5728TCP\u4e2d, Protocols in frame: eth:ip:tcp:of<\/p>\n\n\n\n


flow\u8655\u7406\u7a0b\u5e8f<\/strong>
packet\u9032\u5165openflow switch
\u5047\u5982\u7b26\u5408\u6307\u5b9a\u7684flow\u683c\u5f0f,\u5957\u7528\u6307\u5b9a\u7684actions
\u5047\u5982\u5b8c\u5168\u6c92\u6709\u7b26\u5408,\u5247\u900f\u904esecure channel\u50b3\u7d66controller
ps:
\u82e5\u5c01\u5305\u6c92\u6709\u7b26\u5408,\u53ea\u6703\u5c07\u5c01\u5305\u7684\u524d128bit\u50b3\u7d66controller<\/p>\n\n\n\n

flow\u7684\u58fd\u547d<\/strong>
\u6bcf\u500bflow\u6703\u4f9d\u64da\u4ee5\u4e0b\u5169\u7a2e\u65b9\u5f0f\u88ab\u522a\u9664
idle_timeout(\u8a72flow\u4e00\u76f4\u672a\u4f7f\u7528\u5247\u81ea\u52d5\u522a\u9664)
hard_timeout(\u6307\u5b9a\u6642\u9593\u4e00\u5230\u81ea\u52d5\u522a\u9664\u8a72flow,\u4e26\u767c\u51fa\u8a0a\u606f)
ps:
If both idle_timeout and hard_timeout are zero, the entry is considered permanent and will never time out<\/p>\n\n\n\n

flow\u7684priority<\/strong>
default is the highest priority
Higher priority entries must match before lower priority ones
If multiple entries have the same priority, the switch is free to choose any ordering<\/p>\n\n\n\n

………………………………………………<\/p>\n\n\n\n

flow\u683c\u5f0f<\/strong><\/p>\n\n\n\n

flow\u683c\u5f0f
[header][counters][actions]<\/strong>
header
\u3000\u7528\u4f86\u6bd4\u5c0d\u662f\u5426\u70ba\u6307\u5b9a\u7684flow
counters:
\u3000\u7528\u4f86\u7d71\u8a08flow\u6578\u64da
actions:
\u3000\u9810\u8a2daction\u70ba\u4e1f\u68c4
\u3000\u82e5\u4e0d\u652f\u63f4\u5247\u56de\u61c9unspoorted flow error
\u3000\u4e00\u500bflow\u53ef\u4ee5\u6307\u5b9a\u591a\u500baction<\/p>\n\n\n\n

…<\/p>\n\n\n\n

[header]<\/strong>
\u6709\u4ee5\u4e0b\u6b04\u4f4d
ingress port(\u9032\u5165\u63a5\u53e3):
ether src
ether dst
ether type: 0x0806(arp), 0x0800(ip)
vlan id
vlan priority
ip src:\u4f86\u6e90ip,\u652f\u63f4mask
ip dst:\u76ee\u5730ip,\u652f\u63f4mask
ip proto: 1(icmp),6(tcp),17(udp)
ip tos bits
transport src port\/icmp type
transport dst port\/icmp code<\/p>\n\n\n\n

…<\/p>\n\n\n\n

[counter]<\/strong>
\u4f9d\u985e\u578b\u53ef\u5206\u70ba\u4ee5\u4e0b\u6b04\u4f4d
per table
\u3000active entires
\u3000packet lookups
\u3000packet matches
per flow
\u3000received packets
\u3000received bytes
\u3000duration(seconds)
\u3000duration(nanoseconds)
per port
\u3000received packets
\u3000transmitted packets
\u3000received bytes
\u3000transmitted bytes
\u3000receive drops
\u3000transmit drops
\u3000receive errors
\u3000transmit errors
\u3000receive frame alignment erros
\u3000receive overrun errors
\u3000receive CRC errors
\u3000collisions
per queue
\u3000transmit packets
\u3000transmit bytes
\u3000transmit overrun errors<\/p>\n\n\n\n

…<\/p>\n\n\n\n

[actions]<\/strong>
\u5206\u70barequired\u548coptional<\/p>\n\n\n\n

Required Actions<\/strong>:\u8a2d\u5099\u5fc5\u9808\u652f\u63f4\u7684\u52d5\u4f5c
forward<\/strong>:\u6709\u4ee5\u4e0b\u4e94\u7a2e
\u3000all \u5c07\u5c01\u5305\u9001\u5230\u6240\u6709port,\u4f46\u4e0d\u5305\u62ecinput port
\u3000controller \u5c07\u5b8c\u6574\u5c01\u5305\u5c01\u88dd\u4e26\u9001\u5230controller
\u3000local \u5c07\u5c01\u5305\u9001\u5230local switch\u7684networking stack
\u3000table \u5728flow table\u4e0a\u57f7\u884c\u76f8\u95dc\u52d5\u4f5c,\u4f46\u53ea\u5c0d\u9001\u51fa\u7684\u5c01\u5305\u6709\u4f5c\u7528
\u3000in_port: \u5c07\u5c01\u5305\u9001\u5230input port
drop<\/strong>:\u82e5\u6c92\u6307\u5b9a\u7684\u9810\u8a2d\u52d5\u4f5c<\/p>\n\n\n\n

Optional Actions<\/strong>:\u8a2d\u5099\u53ef\u80fd\u652f\u63f4\u7684\u52d5\u4f5c
forward<\/strong>:\u6709\u4ee5\u4e0b\u4e8c\u7a2e
\u3000normal:\u4f9d\u50b3\u7d71switch\u7684\u65b9\u5f0f\u505a\u8655\u7406
\u3000flood:\u5c07\u5c01\u5305flooding,\u4f46\u4e0d\u5305\u542binput port,\u53ca\u88abstp\u95dc\u9589
enqueue<\/strong>:\u5c07\u5c01\u5305\u8f49\u5230\u5230\u67d0\u500b\u4ecb\u9762\u7684queue,\u53ef\u7528\u4f86\u63d0\u4f9b\u57fa\u672c\u7684qos
mudify-field<\/strong>:\u53ef\u4fee\u6539\u4ee5\u4e0b\u503c
\u3000set vlan id
\u3000set vlan priority
\u3000strip vlan header:\u62ff\u6389vlan\u8cc7\u8a0a
\u3000modify ether src addr
\u3000modify ether dst addr
\u3000modify ipv4 src addr
\u3000modify ipv4 dst addr
\u3000modify ipv4 tos bits
\u3000modify transport src port
\u3000modify transport dst port<\/p>\n\n\n\n


………………………………………………………………<\/p>\n\n\n\n

message<\/strong>
\u6709\u4ee5\u4e0b\u4e09\u7a2e\u985e\u578b
controller-to-switch:\u7531controller\u767c\u51fa
asynchronous:\u7531switch\u8996\u72c0\u6cc1\u96a8\u6642\u50b3\u7d66controller\u7684\u8a0a\u606f
symmetric:\u7528\u4f86\u5efa\u7acb\u53ca\u7dad\u6301\u9023\u7dda\u7684\u8a0a\u606f<\/p>\n\n\n\n


controller-to-switch<\/strong>
\u4e3b\u8981\u6709
feature:\u8207switch\u5efa\u7acbtransport layer security session,\u53ef\u5206\u70ba\u5169\u7a2e
\u3000Controller->Switch:controller\u554fswitch\u8cc7\u8a0a
\u3000Switch->Controller:switch\u56de\u8986controller\u76f8\u95dc\u8cc7\u8a0a
configuration:\u8a2d\u5b9a\u6216\u67e5\u8a62switch
Modify-State:\u7ba1\u7406switch\u7684flow table,\u4e3b\u8981\u5de5\u4f5c\u70baadd,delete,modify flows
read-sate:\u7ba1\u7406switch\u7684flow table\u548c\u4ecb\u9762\u72c0\u614b
send-packet:\u7528\u4f86\u5c07packet\u9001\u5230switch
barrier:\u7528\u4f86\u78ba\u8a8d\u8a0a\u606f<\/p>\n\n\n\n

asynchronous<\/strong>
\u4e3b\u8981\u6709
packet-in:\u82e5switch\u767c\u73fe\u8a72packet\u4e0d\u5728flow table\u5167,\u5247\u900f\u904e\u8a72\u8a0a\u606f\u544a\u77e5controller
flow-removed:\u82e5switch\u767c\u73feflow\u5f9eflow table\u4e2d\u88ab\u79fb\u9664,\u5247\u901a\u77e5controller
port-status:\u82e5switch\u767c\u73feinterface\u8b8a\u5316(ex:\u4ecb\u9762shutdown),\u5247\u901a\u77e5controller
error:\u82e5switch\u767c\u73fe\u554f\u984c\u5247\u901a\u77e5controller<\/p>\n\n\n\n

symmetric<\/strong>
hello:switch\u548ccontroller\u7528\u4f86\u5efa\u7acb\u9023\u7dda,\u53ef\u5206\u70ba\u5169\u7a2e
\u3000Controller->Switch:controller\u50b3\u7d66switch
\u3000Switch->Controller:switch\u56de\u8986controller
echo:\u5224\u65b7controller\u6216switch\u662f\u5426\u9084\u5728\u7dda\u4e0a,\u5169\u4e00\u65b9\u5747\u53ef\u767c\u9001echo,\u63a5\u6536\u65b9\u9700\u56de\u5fa9echo reply\u4ee5\u78ba\u4fdd\u76ee\u524d\u4ecd\u4fdd\u6301\u9023\u63a5
vendor:\u4fdd\u7559<\/p>\n\n\n\n

………………………………<\/p>\n\n\n\n


ref:
https:\/\/www.opennetworking.org\/images\/stories\/downloads\/sdn-resources\/onf-specifications\/openflow\/openflow-spec-v1.0.0.pdf
OpenFlow Switching Performance: Not All TCAM Is Created Equal
http:\/\/packetpushers.net\/openflow-switching-performance-not-all-tcam-is-created-equal\/<\/p>\n","protected":false},"excerpt":{"rendered":"

openflow 1.0\u88ab\u5c01\u88dd\u5728TCP\u4e2d, Protocol …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[29],"tags":[],"class_list":["post-847","post","type-post","status-publish","format-standard","hentry","category-osi-layer7"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts\/847","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/comments?post=847"}],"version-history":[{"count":0,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts\/847\/revisions"}],"wp:attachment":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/media?parent=847"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/categories?post=847"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/tags?post=847"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}