display ipv6 tcp verbose

Use display ipv6 tcp verbose to display detailed information about IPv6 TCP connections.

Syntax

display ipv6 tcp verbose [ slot slot-number [ pcb pcb-index ] ]

display ipv6 tcp verbose [ chassis chassis-number slot slot-number [ pcb pcb-index ] ]

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

pcb pcb-index: Displays detailed information about IPv6 TCP connections of the specified PCB. The value range for the pcb-index argument is 1 to 16.

slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command displays detailed information about IPv6 TCP connections for all cards.

chassis chassis-number slot slot-number: Specifies a card on an IRF member device. The chassis-number argument represents the member ID of the IRF member device. The slot-number argument represents the slot number of the card. If you do not specify a card, this command displays detailed information about IPv6 TCP connections for all cards.

Examples

# Display detailed information about an IPv6 TCP connection.

<Sysname> display ipv6 tcp verbose
TCP inpcb number: 1(tcpcb number: 1)

 Location: Slot: 6 Cpu: 0
 NSR standby: N/A
 Creator: bgpd[199]
 State: ISCONNECTED
 Options: N/A
 Error: 0
 Receiving buffer(cc/hiwat/lowat/state): 0 / 65536 / 1 / N/A
 Sending buffer(cc/hiwat/lowat/state): 0 / 65536 / 512 / N/A
 Type: 1
 Protocol: 6
 Connection info: src = 2001::1->179 ,  dst = 2001::2->4181
 Inpcb flags: N/A
 Inpcb extflag: N/A
 Inpcb vflag: INP_IPV6
 Hop limit: 255 (minimum hop limit: 0)
 Connection state: ESTABLISHED
 TCP options: TF_REQ_SCALE TF_REQ_TSTMP TF_SACK_PERMIT TF_NSR
 NSR state: READY(M)
 Send VRF: 0x0
 Receive VRF: 0x0

Table 55: Command output

Field	Description
TCP inpcb number	Number of IPv6 TCP Internet PCBs.
tcpcb number	Number of IPv6 TCP PCBs (excluding PCBs of TCP in TIME_WAIT state).
Creator	Task name of the socket. The process number is in the square brackets.
State	Socket state.
Options	Socket options.
Error	Error code.
Receiving buffer(cc/hiwat/lowat/state)	Displays receive buffer information in the following order: cc—Used space. hiwat—Maximum space. lowat—Minimum space. state—Buffer state: CANTSENDMORE—Unable to send data to the peer. CANTRCVMORE—Unable to receive data from the peer. RCVATMARK—Receiving tag. N/A—None of the above states.
Sending buffer(cc/hiwat/lowat/state)	Displays send buffer information in the following order: cc—Used space. hiwat—Maximum space. lowat—Minimum space. state—Buffer state: CANTSENDMORE—Unable to send data to the peer. CANTRCVMORE—Unable to receive data from the peer. RCVATMARK—Receiving tag. N/A—None of the above states.
Type	Socket type: 1—SOCK_STREAM. This socket uses TCP to provide reliable transmission of byte streams. 2—SOCK_DGRAM. This socket uses UDP to provide datagram transmission. 3—SOCK_RAW. This socket allows an application to change the next upper-layer protocol header. N/A—None of the above types.
Protocol	Number of the protocol using the socket. 6 represents TCP.
Connection info	Connection information, including source IPv6 address and port number, and destination IPv6 address and port number.
Inpcb flags	Flags in the Internet PCB: INP_RECVOPTS—Receives IPv6 options. INP_RECVRETOPTS—Receives replied IPv6 options. INP_RECVDSTADDR—Receives destination IPv6 address. INP_HDRINCL—Provides the entire IPv6 header. INP_REUSEADDR—Reuses the IPv6 address. INP_REUSEPORT—Reuses the port number. INP_ANONPORT—Port number not specified. INP_PROTOCOL_PACKET—Identifies a protocol packet. INP_RCVVLANID—Receives the VLAN ID of the packet. Only UDP and RawIP support this flag. IN6P_IPV6_V6ONLY—Only supports IPv6 protocol stack. IN6P_PKTINFO—Receives the source IPv6 address and input interface of the packet. IN6P_HOPLIMIT—Receives the hop limit. IN6P_HOPOPTS—Receives the hop-by-hop options extension header. IN6P_DSTOPTS—Receives the destination options extension header. IN6P_RTHDR—Receives the routing extension header. IN6P_RTHDRDSTOPTS—Receives the destination options extension header preceding the routing extension header. IN6P_TCLASS—Receives the traffic class of the packet. IN6P_AUTOFLOWLABEL—Attaches a flow label automatically. IN6P_RFC2292—Uses the API specified in RFC 2292. IN6P_MTU—Discovers differences in the MTU size of every link along a given data path. TCP does not support this flag. INP_RCVMACADDR—Receives the MAC address of the frame. INP_SYNCPCB—Waits until Internet PCB is synchronized. N/A—None of the above flags.
Inpcb extflag	Extension flags in the Internet PCB: INP_EXTRCVPVCIDX—Records the PVC index of the received packet. INP_RCVPWID—Records the PW ID of the received packet. INP_EXTDONTDROP—Does not drop the received packet. INP_EXLISTEN—Listening socket. N/A—None of the above flags.
Inpcb vflag	IP version flags in the Internet PCB: INP_IPV4—IPv4 protocol. INP_IPV6—IPv6 protocol. INP_IPV6PROTO—Creates an Internet PCB based on IPv6 protocol. INP_TIMEWAIT—In TIMEWAIT state. INP_ONESBCAST—Sends broadcast packets. INP_DROPPED—Protocol dropped flag. INP_SOCKREF—Strong socket reference. INP_DONTBLOCK—Do not block synchronization of the Internet PCB. N/A—None of the above flags.
Hop limit	Hop limit in the Internet PCB.
Connection state	TCP connection state: CLOSED—The server receives a disconnection request's reply from the client. LISTEN—The server is waiting for connection requests. SYN_SENT—The client is waiting for the server to reply to the connection request. SYN_RCVD—The server receives a connection request. ESTABLISHED—The server and client have established connections and can transmit data bidirectionally. CLOSE_WAIT—The server receives a disconnection request from the client. FIN_WAIT_1—The client is waiting for the server to reply to a disconnection request. CLOSING—The server and client are waiting for peer's disconnection reply when receiving disconnection requests from each other. LAST_ACK—The server is waiting for the client to reply to a disconnection request. FIN_WAIT_2—The client receives a disconnection reply from the server. TIME_WAIT—The client receives a disconnection request from the server.
TCP options	TCP options: TF_MD5SIG—Enables MD5 signature. TF_NODELAY—Disables the Nagle algorithm that buffers the sent data inside the TCP. TF_NOOPT—No TCP options. TF_NOPUSH—Forces TCP to delay sending any TCP data until a full sized segment is buffered in the TCP buffers. TF_BINDFOREIGNADDR—Binds the peer IP address. TF_NSR—Enables TCP NSR. TF_REQ_SCALE—Enables the TCP window scale option. TF_REQ_TSTMP—Enables the time stamp option. TF_SACK_PERMIT—Enables the TCP selective acknowledgement option. TF_ENHANCED_AUTH—Enables the enhanced authentication option.
NSR state	State of the TCP connections. Between the parentheses is the role of the connection: M—Main connection. S—Standby connection.
Send VRF	VRF from which packets are sent.
Receive VRF	VRF from which packets are received.