SDN Switch Code Tracing Process
SDN
Switch-Code Tracing
Outline
•
概念
•
First packet of SDN
switch
•
Packet in
•
Packet out
•
Switch LLDP
概念
圖片來源
/ EstiNet
•
在
SDN
中，是以
controller
為中心。
•
當第一個
packet
進到
switch
時，該如何進
行判斷？①
•
Switch
將哪些資料傳送至
controller(packet
in)
。
②
•
Controller
下達
flow-mod
至
switch(packet
out)
，將動作新增至
flow table
內，在
ASIC
運行。③
•
第二個開始進
switch
的
packet
會依照
flow
table
而進行動作。④⑤
Outline
•
概念
•
First packet of SDN switch
•
Packet in
•
Packet out
•
Switch LLDP
First packet of SDN switch
•
The required fields don’t
need to be implemented in all
flow tables, and don’t need to
be implemented in the same
flow table.
First packet of SDN switch(cont.)
將需比對位置設定成
NULL
，避免重
複比對舊的資料
OFPXMT_OFB_IN_PORT
OFPXMT_OFB_IN_PHY_PORT
OFPXMT_OFB_VLAN_VID
OFPXMT_OFB_VLAN_PCP
OFPXMT_OFB_ETH_TYPE
OFPXMT_OFB_IP_DSCP
OFPXMT_OFB_IP_ECN
OFPXMT_OFB_IP_PROTO
OFPXMT_OFB_IPV4_SRC
OFPXMT_OFB_IPV4_DST
OFPXMT_OFB_TCP_SRC
OFPXMT_OFB_TCP_DST
OFPXMT_OFB_UDP_SRC
OFPXMT_OFB_UDP_DST
OFPXMT_OFB_SCTP_SRC
OFPXMT_OFB_SCTP_DST
OFPXMT_OFB_ICMPV4_TYPE
OFPXMT_OFB_ICMPV4_CODE
OFPXMT_OFB_ARP_OP
OFPXMT_OFB_ARP_SPA
OFPXMT_OFB_ARP_TPA
OFPXMT_OFB_ARP_SHA
OFPXMT_OFB_ARP_THA
OFPXMT_OFB_IPV6_SRC
OFPXMT_OFB_IPV6_DST
OFPXMT_OFB_ICMPV6_TYPE
OFPXMT_OFB_ICMPV6_CODE
OFPXMT_OFB_MPLS_LABEL
OFPXMT_OFB_MPLS_TC
OFPXMT_OFB_MPLS_BOS
Outline
•
概念
•
First packet of SDN switch
•
Packet in
•
Packet out
•
Switch LLDP
Packet in
•
Packet in
的產生原因？
沒有匹配到
flow table entry(OFPR_NO_MATCH = 0)
明確指定轉發給
controller(OFPR_ACTION = 1)
Packet
存在無效的
TTL(OFPR_INVALID_TTL = 2)
Connect controller – packet in
Outline
•
概念
•
First packet of SDN switch
•
Packet in
•
Packet out
•
Switch LLDP
Packet out
•
將
controller
的
data
發送到
OpenFlow
switch
，
包含發送命令的消息。
Connect controller – packet out
agent_send_packet_out
agent_recv_packet_out
Outline
•
概念
•
First packet of SDN switch
•
Packet in
•
Packet out
•
Switch LLDP
Switch LLDP
部分
•
未在
switch
code
部分找到
LLDP
的程式碼
▲在
Ryu
抓的封包
▲在
Estinet
抓到的封包
This content delves into the intricate process of tracing code within SDN switches. It covers topics such as the first packet handling, LLDP communication, flow table operations, and controller interactions. Through detailed images and descriptions, readers gain insight into the functionalities and protocols involved in SDN switch operations.
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Presentation Transcript
Outline First packet of SDN switch Packet in Packet out Switch LLDP
SDN controller packet switch Switch controller(packet in) Controller flow-mod switch(packet out) flow table ASIC switch packet flow table / EstiNet
Outline First packet of SDN switch Packet in Packet out Switch LLDP
First packet of SDN switch The required fields don t need to be implemented in all flow tables, and don t need to be implemented in the same flow table.
OFPXMT_OFB_IN_PORT OFPXMT_OFB_IN_PHY_PORT OFPXMT_OFB_VLAN_VID OFPXMT_OFB_VLAN_PCP OFPXMT_OFB_ETH_TYPE OFPXMT_OFB_IP_DSCP OFPXMT_OFB_IP_ECN OFPXMT_OFB_IP_PROTO OFPXMT_OFB_IPV4_SRC OFPXMT_OFB_IPV4_DST OFPXMT_OFB_TCP_SRC OFPXMT_OFB_TCP_DST OFPXMT_OFB_UDP_SRC OFPXMT_OFB_UDP_DST OFPXMT_OFB_SCTP_SRC OFPXMT_OFB_SCTP_DST OFPXMT_OFB_ICMPV4_TYPE OFPXMT_OFB_ICMPV4_CODE OFPXMT_OFB_ARP_OP OFPXMT_OFB_ARP_SPA OFPXMT_OFB_ARP_TPA OFPXMT_OFB_ARP_SHA OFPXMT_OFB_ARP_THA OFPXMT_OFB_IPV6_SRC OFPXMT_OFB_IPV6_DST OFPXMT_OFB_ICMPV6_TYPE OFPXMT_OFB_ICMPV6_CODE OFPXMT_OFB_MPLS_LABEL OFPXMT_OFB_MPLS_TC OFPXMT_OFB_MPLS_BOS
Outline First packet of SDN switch Packet in Packet out Switch LLDP
Packet in Packet in flow table entry(OFPR_NO_MATCH = 0) controller(OFPR_ACTION = 1) Packet TTL(OFPR_INVALID_TTL = 2)
Outline First packet of SDN switch Packet in Packet out Switch LLDP
Packet out controller data OpenFlow switch
Connect controller packet out agent_recv_packet_out agent_send_packet_out
