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- Table of Contents
-
- 05-Layer 3 - IP Services Command Reference
- 00-Preface
- 01-ARP Commands
- 02-IP Addressing Commands
- 03-DHCP Commands
- 04-DNS Commands
- 05-NAT Commands
- 06-IP Performance Optimization Commands
- 07-Adjacency Table Commands
- 08-UDP Helper Commands
- 09-IPv6 Basics Commands
- 10-DHCPv6 Commands
- 11-IPv6 DNS Commands
- 12-NAT-PT Commands
- 13-Tunneling Commands
- 14-GRE Commands
- Related Documents
-
| Title | Size | Download |
|---|---|---|
| 06-IP Performance Optimization Commands | 133.35 KB |
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NOTE: In this documentation, SPC cards refer to the interface cards prefixed with SPC, for example, SPC-GT48L. SPE cards refer to the base cards prefixed with SPE, for example, SPE-1020-E-II. |
display fib
Syntax
display fib [ vpn-instance vpn-instance-name ] [ | { begin | exclude | include regular-expression | acl acl-number | ip-prefix ip-prefix-name ]
View
Any view
Default level
1: Monitor level
Parameters
vpn-instance vpn-instance-name: Displays the FIB entries of the specified VPN instance. The vpn-instance-name is a string of 1 to 31 case-sensitive characters. If no VPN instance is specified, FIB entries of the public network are displayed.
|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
include: Displays all lines that match the specified regular expression.
exclude: Displays all lines that do not match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
acl acl-number: Displays FIB entries matching a specified ACL numbered from 2000 to 2999. If the specified ACL does not exist, all FIB entries are displayed.
ip-prefix ip-prefix-name: Displays FIB entries matching a specified IP prefix list, a string of 1 to 19 characters. If the specified IP prefix list does not exist, all FIB entries are displayed.
Description
Use the display fib command to display FIB entries. If no parameters are specified, all FIB entries will be displayed.
Examples
# Display all FIB entries.
<Sysname> display fib
Destination count: 4 FIB entry count: 4
Flag:
U:Useable G:Gateway H:Host B:Blackhole D:Dynamic S:Static
R:Relay
Destination/Mask Nexthop Flag OutInterface InnerLabel Token
10.2.0.0/16 10.2.1.1 U GE3/1/1 Null Invalid
10.2.1.1/32 127.0.0.1 UH InLoop0 Null Invalid
127.0.0.0/8 127.0.0.1 U InLoop0 Null Invalid
127.0.0.1/32 127.0.0.1 UH InLoop0 Null Invalid
# Display FIB information matching ACL 2000.
<Sysname> system-view
[Sysname] acl number 2000
[Sysname-acl-basic-2000] rule permit source 10.2.0.0 0.0.255.255
[Sysname-acl-basic-2000] display fib acl 2000
Destination count: 2 FIB entry count: 2
Flag:
U:Useable G:Gateway H:Host B:Blackhole D:Dynamic S:Static
R:Relay
Destination/Mask Nexthop Flag OutInterface InnerLabel Token
10.2.0.0/16 10.2.1.1 U GE3/1/1 Null Invalid
10.2.1.1/32 127.0.0.1 UH InLoop0 Null Invalid
# Display all entries that contain the string 127 and start from the first one.
<Sysname> display fib | begin 127
Flag:
U:Useable G:Gateway H:Host B:Blackhole D:Dynamic S:Static
R:Relay
Destination/Mask Nexthop Flag OutInterface InnerLabel Token
10.2.1.1/32 127.0.0.1 UH InLoop0 Null Invalid
127.0.0.0/8 127.0.0.1 U InLoop0 Null Invalid
127.0.0.1/32 127.0.0.1 UH InLoop0 Null Invalid
# Display FIB information passing the IP prefix list abc0.
<Sysname> system-view
[Sysname] ip ip-prefix abc0 permit 10.2.0.0 16
[Sysname] display fib ip-prefix abc0
Destination count: 1 FIB entry count: 1
Flag:
U:Useable G:Gateway H:Host B:Blackhole D:Dynamic S:Static
R:Relay
Destination/Mask Nexthop Flag OutInterface InnerLabel Token
10.2.0.0/16 10.2.1.1 U GE3/1/1 Null Invalid
|
Field |
Description |
|
Destination count |
Total number of destination addresses |
|
FIB entry count |
Total number of FIB entries |
|
Destination/Mask |
Destination address/length of mask |
|
Nexthop |
Address of next hop |
|
Flag |
Flags of routes: · U—Usable route · G—Gateway route · H—Host route · B—Blackhole route · D—Dynamic route · S—Static route · R—Relay route |
|
OutInterface |
Forwarding interface |
|
InnerLabel |
Inner label |
|
Token |
LSP index number |
display fib ip-address
Syntax
display fib [ vpn-instance vpn-instance-name ] ip-address [ mask | mask-length ] [ | { begin | exclude | include } regular-expression ]
View
Any view
Default level
1: Monitor level
Parameters
vpn-instance vpn-instance-name: Displays the FIB entries of the specified VPN instance. The vpn-instance-name is a string of 1 to 31 case-sensitive characters. If no VPN instance is specified, FIB entries of the public network are displayed.
ip-address: Destination IP address, in dotted decimal notation.
mask: IP address mask.
mask-length: Length of IP address mask.
|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
include: Displays all lines that match the specified regular expression.
exclude: Displays all lines that do not match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
Description
Use the display fib ip-address command to display FIB entries that match the specified destination IP address.
If no mask or mask length is specified, the FIB entry that matches the destination IP address and has the longest mask will be displayed; if the mask is specified, the FIB entry that exactly matches the specified destination IP address will be displayed.
Examples
# Display the FIB entries that match the destination IP address of 10.2.1.1.
<Sysname> display fib 10.2.1.1
Destination count: 1 FIB entry count: 1
Flag:
U:Useable G:Gateway H:Host B:Blackhole D:Dynamic S:Static
R:Relay
Destination/Mask Nexthop Flag OutInterface InnerLabel Token
10.2.1.1/32 127.0.0.1 UH InLoop0 Null Invalid
For the output description, see Table 1.
display icmp statistics
Syntax
display icmp statistics [ slot slot-number ] [ | { begin | exclude | include } regular-expression ]
View
Any view
Default level
1: Monitor level
Parameters
slot slot-number: Displays the ICMP statistics of the specified card.
|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
include: Displays all lines that match the specified regular expression.
exclude: Displays all lines that do not match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
Description
Use the display icmp statistics command to display ICMP statistics.
Related commands: display ip interface and reset ip statistics.
Examples
# Display ICMP statistics.
<Sysname> display icmp statistics
Input: bad formats 0 bad checksum 0
echo 5 destination unreachable 0
source quench 0 redirects 0
echo reply 10 parameter problem 0
timestamp 0 information request 0
mask requests 0 mask replies 0
time exceeded 0
Output:echo 10 destination unreachable 0
source quench 0 redirects 0
echo reply 5 parameter problem 0
timestamp 0 information reply 0
mask requests 0 mask replies 0
time exceeded 0
Table 2 Output description
|
Field |
Description |
|
bad formats |
Number of input wrong format packets |
|
bad checksum |
Number of input wrong checksum packets |
|
echo |
Number of input/output echo packets |
|
destination unreachable |
Number of input/output destination unreachable packets |
|
source quench |
Number of input/output source quench packets |
|
redirects |
Number of input/output redirect packets |
|
echo reply |
Number of input/output replies |
|
parameter problem |
Number of input/output parameter problem packets |
|
timestamp |
Number of input/output time stamp packets |
|
information request |
Number of input information request packets |
|
mask requests |
Number of input/output mask requests |
|
mask replies |
Number of input/output mask replies |
|
information reply |
Number of output information reply packets |
|
time exceeded |
Number of input/output expiration packets |
display ip socket
Syntax
display ip socket [ socktype sock-type ] [ task-id socket-id ] [ slot slot-number ] [ | { begin | exclude | include } regular-expression ]
View
Any view
Default level
1: Monitor level
Parameters
socktype sock-type: Displays the socket information of this type. The sock type is in the range of 1 to 3, corresponding to TCP, UDP and raw IP respectively.
task-id: Displays the socket information of this task. Task ID is in the range of 1 to 180.
socket-id: Displays the information of the socket. Socket ID is in the range of 0 to 3072.
slot-number: Displays the socket information of the specified card.
|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
include: Displays all lines that match the specified regular expression.
exclude: Displays all lines that do not match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
Description
Use the display ip socket command to display socket information.
Examples
# Display all socket information.
<Sysname> display ip socket
SOCK_STREAM:
Task = VTYD(64), socketid = 1, Proto = 6,
LA = 0.0.0.0:23, FA = 0.0.0.0:0,
sndbuf = 8192, rcvbuf = 8192, sb_cc = 0, rb_cc = 0,
socket option = SO_ACCEPTCONN SO_KEEPALIVE SO_REUSEPORT SO_SETKEEPALIVE,
socket state = SS_PRIV SS_ASYNC
Task = ROUT(92), socketid = 2, Proto = 6,
LA = 0.0.0.0:179, FA = 33.33.33.33:0,
sndbuf = 8192, rcvbuf = 8192, sb_cc = 0, rb_cc = 0,
socket option = SO_ACCEPTCONN SO_REUSEADDR SO_REUSEPORT SO_SENDVPNID(0) SO_RCVVPNID(0),
socket state = SS_PRIV SS_ASYNC
Task = LDP(98), socketid = 2, Proto = 6,
LA = 0.0.0.0:646, FA = 0.0.0.0:0,
sndbuf = 8192, rcvbuf = 8192, sb_cc = 0, rb_cc = 0,
socket option = SO_ACCEPTCONN SO_REUSEADDR SO_REUSEPORT SO_SENDVPNID(0) SO_RCVVPNID(0),
socket state = SS_PRIV SS_ASYNC
Task = LDP(98), socketid = 3, Proto = 6,
LA = 55.55.55.55:1055, FA = 22.22.22.22:646,
sndbuf = 8192, rcvbuf = 8192, sb_cc = 0, rb_cc = 0,
socket option = SO_REUSEADDR SO_SENDVPNID(0) SO_RCVVPNID(0),
socket state = SS_ISCONNECTED SS_PRIV SS_ASYNC
Task = ROUT(92), socketid = 3, Proto = 6,
LA = 55.55.55.55:1059, FA = 33.33.33.33:179,
sndbuf = 8192, rcvbuf = 8192, sb_cc = 0, rb_cc = 0,
socket option = SO_REUSEADDR SO_LINGER SO_SENDVPNID(0) SO_RCVVPNID(0),
socket state = SS_ISCONNECTED SS_PRIV SS_ASYNC
Task = VTYD(64), socketid = 3, Proto = 6,
LA = 192.168.1.145:23, FA = 192.168.1.1:2957,
sndbuf = 8192, rcvbuf = 8192, sb_cc = 0, rb_cc = 0,
socket option = SO_KEEPALIVE SO_OOBINLINE SO_REUSEPORT SO_SETKEEPALIVE,
socket state = SS_ISCONNECTED SS_PRIV SS_ASYNC
Task = VTYD(64), socketid = 4, Proto = 6,
LA = 192.168.1.145:23, FA = 192.168.1.67:1411,
sndbuf = 8192, rcvbuf = 8192, sb_cc = 0, rb_cc = 0,
socket option = SO_KEEPALIVE SO_OOBINLINE SO_REUSEPORT SO_SETKEEPALIVE,
socket state = SS_ISCONNECTED SS_PRIV SS_ASYNC
SOCK_DGRAM:
Task = DHCP(65), socketid = 2, Proto = 17,
LA = 0.0.0.0:67, FA = 0.0.0.0:0,
sndbuf = 9216, rcvbuf = 41600, sb_cc = 0, rb_cc = 0,
socket option = SO_BROADCAST SO_REUSEPORT SO_UDPCHECKSUM,
socket state = SS_PRIV SS_ASYNC
Task = LDP(98), socketid = 1, Proto = 17,
LA = 0.0.0.0:646, FA = 0.0.0.0:0,
sndbuf = 9216, rcvbuf = 41600, sb_cc = 0, rb_cc = 0,
socket option = SO_REUSEADDR SO_UDPCHECKSUM SO_SETSRCADDR SO_SENDVPNID(0) SO_RCVVPNID(0),
socket state = SS_PRIV SS_ASYNC
Task = RDSO(79), socketid = 1, Proto = 17,
LA = 0.0.0.0:1024, FA = 0.0.0.0:0,
sndbuf = 9216, rcvbuf = 41600, sb_cc = 0, rb_cc = 0,
socket option = SO_UDPCHECKSUM,
socket state = SS_PRIV
Task = RDSO(79), socketid = 2, Proto = 17,
LA = 0.0.0.0:1812, FA = 0.0.0.0:0,
sndbuf = 9216, rcvbuf = 41600, sb_cc = 0, rb_cc = 0,
socket option = SO_UDPCHECKSUM,
socket state = SS_PRIV
SOCK_RAW:
Task = DHCP(65), socketid = 1, Proto = 1,
LA = 0.0.0.0, FA = 0.0.0.0,
sndbuf = 8192, rcvbuf = 8192, sb_cc = 0, rb_cc = 0,
socket option = 0,
socket state = SS_PRIV SS_ASYNC
Task = ROUT(92), socketid = 4, Proto = 89,
LA = 0.0.0.0, FA = 0.0.0.0,
sndbuf = 262144, rcvbuf = 262144, sb_cc = 0, rb_cc = 0,
socket option = SO_SENDVPNID(0) SO_RCVVPNID(0),
socket state = SS_PRIV SS_ASYNC
Task = RSVP(97), socketid = 1, Proto = 46,
LA = 0.0.0.0, FA = 0.0.0.0,
sndbuf = 4194304, rcvbuf = 4194304, sb_cc = 0, rb_cc = 0,
socket option = 0,
socket state = SS_PRIV SS_NBIO SS_ASYNC
Table 3 Output description
|
Field |
Description |
|
SOCK_STREAM |
TCP socket |
|
SOCK_DGRAM |
UDP socket |
|
SOCK_RAW |
raw IP socket |
|
Task |
Task number |
|
socketid |
Socket ID |
|
Proto |
Protocol number |
|
LA |
Local address and local port number |
|
FA |
Remote address and remote port number |
|
sndbuf |
Sending buffer size of the socket, in bytes |
|
rcvbuf |
Receiving buffer size of the socket, in bytes |
|
sb_cc |
Current data size in the sending buffer (It is available only for TCP that can buffer data) |
|
rb_cc |
Data size currently in the receiving buffer |
|
socket option |
Socket option |
|
socket state |
Socket state |
display ip statistics
Syntax
display ip statistics [ slot slot-number ] [ | { begin | exclude | include } regular-expression ]
View
Any view
Default level
1: Monitor level
Parameters
slot slot-number: Displays statistics of IP packets on the slot.
|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
include: Displays all lines that match the specified regular expression.
exclude: Displays all lines that do not match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
Description
Use the display ip statistics command to display statistics of IP packets.
Related commands: display ip interface and reset ip statistics.
Examples
# Display statistics of IP packets.
<Sysname> display ip statistics
Input: sum 7120 local 112
bad protocol 0 bad format 0
bad checksum 0 bad options 0
Output: forwarding 0 local 27
dropped 0 no route 2
compress fails 0
Fragment:input 0 output 0
dropped 0
fragmented 0 couldn't fragment 0
Reassembling:sum 0 timeouts 0
Table 4 Output description
|
Field |
Description |
|
|
Input: |
sum |
Total number of packets received |
|
local |
Total number of packets with destination being local |
|
|
bad protocol |
Total number of unknown protocol packets |
|
|
bad format |
Total number of packets with incorrect format |
|
|
bad checksum |
Total number of packets with incorrect checksum |
|
|
bad options |
Total number of packets with incorrect option |
|
|
Output: |
forwarding |
Total number of packets forwarded |
|
local |
Total number of packets sent from the local |
|
|
dropped |
Total number of packets discarded |
|
|
no route |
Total number of packets for which no route is available |
|
|
compress fails |
Total number of packets failed to compress |
|
|
Fragment: |
input |
Total number of fragments received |
|
output |
Total number of fragments sent |
|
|
dropped |
Total number of fragments dropped |
|
|
fragmented |
Total number of packets successfully fragmented |
|
|
couldn't fragment |
Total number of packets that failed to be fragmented |
|
|
Reassembling |
sum |
Total number of packets reassembled |
|
timeouts |
Total number of reassembly timeout fragments |
|
display tcp statistics
Syntax
display tcp statistics [ | { begin | exclude | include } regular-expression ]
View
Default level
1: Monitor level
Parameters
|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
include: Displays all lines that match the specified regular expression.
exclude: Displays all lines that do not match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
Description
Use the display tcp statistics command to display statistics of TCP traffic.
Related commands: display tcp status and reset tcp statistics.
Examples
# Display statistics of TCP traffic.
<Sysname> display tcp statistics
Received packets:
Total: 18042
packets in sequence: 2691 (3362 bytes)
window probe packets: 0, window update packets: 1
checksum error: 0, offset error: 0, short error: 0
duplicate packets: 1 (8 bytes), partially duplicate packets: 0 (0 bytes)
out-of-order packets: 0 (0 bytes)
packets of data after window: 0 (0 bytes)
packets received after close: 0
ACK packets: 4042 (155590 bytes)
duplicate ACK packets: 12330, too much ACK packets: 0
Sent packets:
Total: 5989
urgent packets: 0
control packets: 3 (including 7 RST)
window probe packets: 0, window update packets: 0
data packets: 5914 (155584 bytes) data packets retransmitted: 0 (0 bytes)
ACK-only packets: 72 (65 delayed)
Retransmitted timeout: 0, connections dropped in retransmitted timeout: 0
Keepalive timeout: 12350, keepalive probe: 12348, Keepalive timeout, so connections disconnected : 2
Initiated connections: 0, accepted connections: 5, established connections: 5
Closed connections: 5 (dropped: 2, initiated dropped: 0)
Packets dropped with MD5 authentication: 0
Packets permitted with MD5 authentication: 0
Table 5 Output description
|
Field |
Description |
|
|
Received packets: |
Total |
Total number of packets received |
|
packets in sequence |
Number of packets arriving in sequence |
|
|
window probe packets |
Number of window probe packets received |
|
|
window update packets |
Number of window update packets received |
|
|
checksum error |
Number of checksum error packets received |
|
|
offset error |
Number of offset error packets received |
|
|
short error |
Number of received packets with length being too small |
|
|
duplicate packets |
Number of completely duplicate packets received |
|
|
partially duplicate packets |
Number of partially duplicate packets received |
|
|
out-of-order packets |
Number of out-of-order packets received |
|
|
packets of data after window |
Number of packets outside the receiving window |
|
|
packets received after close |
Number of packets that arrived after connection is closed |
|
|
ACK packets |
Number of ACK packets received |
|
|
duplicate ACK packets |
Number of duplicate ACK packets received |
|
|
too much ACK packets |
Number of ACK packets for data unsent |
|
|
Sent packets: |
Total |
Total number of packets sent |
|
urgent packets |
Number of urgent packets sent |
|
|
control packets |
Number of control packets sent |
|
|
window probe packets |
Number of window probe packets sent; in the brackets are resent packets |
|
|
window update packets |
Number of window update packets sent |
|
|
data packets |
Number of data packets sent |
|
|
data packets retransmitted |
Number of data packets retransmitted |
|
|
ACK-only packets |
Number of ACK packets sent; in brackets are delayed ACK packets |
|
|
Retransmitted timeout |
Number of retransmission timer timeouts |
|
|
connections dropped in retransmitted timeout |
Number of connections broken due to retransmission timeouts |
|
|
Keepalive timeout |
Number of keepalive timer timeouts |
|
|
keepalive probe |
Number of keepalive probe packets sent |
|
|
Keepalive timeout, so connections disconnected |
Number of connections broken due to timeout of the keepalive timer |
|
|
Initiated connections |
Number of connections initiated |
|
|
accepted connections |
Number of connections accepted |
|
|
established connections |
Number of connections established |
|
|
Closed connections |
Number of connections closed; in brackets are connections closed accidentally (before receiving SYN from the peer) and connections closed initiatively (after receiving SYN from the peer) |
|
|
Packets dropped with MD5 authentication |
Number of packets dropped with MD5 authentication |
|
|
Packets permitted with MD5 authentication |
Number of packets permitted with MD5 authentication |
|
display udp statistics
Syntax
display udp statistics [ | { begin | exclude | include } regular-expression ]
View
Any view
Default level
1: Monitor level
Parameters
|: Filters command output by specifying a regular expression. For more information about regular expressions, see Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
include: Displays all lines that match the specified regular expression.
exclude: Displays all lines that do not match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
Description
Use the display udp statistics command to display statistics of UDP packets.
Related commands: reset udp statistics.
Examples
# Display statistics of UDP packets.
<Sysname> display udp statistics
Received packets:
Total: 0
checksum error: 0
shorter than header: 0, data length larger than packet: 0
unicast(no socket on port): 0
broadcast/multicast(no socket on port): 0
not delivered, input socket full: 0
input packets missing pcb cache: 0
Sent packets:
Total: 0
Table 6 Output description
|
Field |
Description |
|
|
Received packets: |
Total |
Total number of UDP packets received |
|
checksum error |
Total number of packets with incorrect checksum |
|
|
shorter than header |
Number of packets with data shorter than head |
|
|
data length larger than packet |
Number of packets with data longer than packet |
|
|
unicast(no socket on port) |
Number of unicast packets with no socket on port |
|
|
broadcast/multicast(no socket on port) |
Number of broadcast/multicast packets without socket on port |
|
|
not delivered, input socket full |
Number of packets not delivered to upper layer due to socket buffer being full |
|
|
input packets missing pcb cache |
Number of packets without matching protocol control block (PCB) cache |
|
|
Sent packets: |
Total |
Total number of UDP packets sent |
ip forward-broadcast
Syntax
ip forward-broadcast [ acl acl-number ]
undo ip forward-broadcast
View
Interface view
Default level
2: System level
Parameters
acl acl-number: Access control list number, in the range of 2000 to 3999. Numbers from 2000 to 2999 are for basic ACLs, and from 3000 to 3999 are for advanced ACLs. Only directed broadcasts permitted by the ACL can be forwarded. The router does not support the option.
Description
Use the ip forward-broadcast command to enable the interface to forward directed broadcasts to a directly-connected network.
Use the undo ip forward-broadcast command to disable the interface from forwarding directed broadcasts to a directly-connected network.
By default, an interface is disabled from forwarding directed broadcasts to a directly-connected network.
|
|
CAUTION: The system does not support this command when working in hybrid mode. For more information about system working modes, see Fundamentals Configuration Guide. |
Examples
# Enable VLAN-interface 10 to forward the directed broadcasts to a directly-connected network matching ACL 2001.
<Sysname> system-view
[Sysname] interface Vlan-interface 10
[Sysname- Vlan-interface10] ip forward-broadcast acl 2001
ip icmp flow-control
Syntax
ip icmp flow-control
undo ip icmp flow-control
View
System view
Default level
2: System level
Parameters
None
Description
Use the ip icmp flow-control command to enable ICMP flow control.
Use the undo ip icmp flow-control command to disable ICMP flow control.
By default, ICMP flow control is disabled.
Examples
# Enable ICMP flow control.
<Sysname> system-view
[Sysname] ip icmp flow-control
ip icmp-extensions
Syntax
ip icmp-extensions { compliant | non-compliant }
undo ip icmp-extensions
View
System view
Default level
2: System level
Parameters
compliant: Specifies the compliant mode.
non-compliant: Specifies the non-compliant mode.
Description
Use the ip icmp-extensions command to enable support for ICMP extensions.
Use the undo ip icmp-extensions command to disable support for ICMP extensions.
By default, ICMP extensions are not supported.
Examples
# Enable support for ICMP extensions in compliant mode.
<Sysname> system-view
[Sysname] ip icmp-extensions compliant
ip redirects enable
Syntax
ip redirects enable
undo ip redirects
View
System view
Default level
2: System level
Parameters
None
Description
Use the ip redirects enable command to enable sending of ICMP redirect packets.
Use the undo ip redirects command to disable sending of ICMP redirect packets.
This feature is disabled by default.
|
|
NOTE: On SPC cards, you can enable sending of ICMP redirect packets only on VLAN interfaces. |
Examples
# Enable sending of ICMP redirect packets.
<Sysname> system-view
[Sysname] ip redirects enable
ip ttl-expires enable
Syntax
ip ttl-expires enable
undo ip ttl-expires
View
System view
Default level
2: System level
Parameters
None
Description
Use the ip ttl-expires enable command to enable the sending of ICMP timeout packets.
Use the undo ip ttl-expires command to disable sending of ICMP timeout packets.
Sending of ICMP timeout packets is disabled by default.
If the feature is disabled, the router will not send TTL timeout ICMP packets, but still send “reassembly timeout” ICMP packets.
Examples
# Enable sending of ICMP timeout packets.
<Sysname> system-view
[Sysname] ip ttl-expires enable
ip unreachables enable
Syntax
ip unreachables enable
undo ip unreachables
View
System view
Default level
2: System level
Parameters
None
Description
Use the ip unreachables enable command to enable the sending of ICMP destination unreachable packets.
Use the undo ip unreachables command to disable sending of ICMP destination unreachable packets.
Sending of ICMP destination unreachable packets is disabled by default.
Examples
# Enable sending of ICMP destination unreachable packets.
<Sysname> system-view
[Sysname] ip unreachables enable
reset ip statistics
Syntax
reset ip statistics [ slot slot-number ]
View
User view
Default level
2: System level
Parameters
slot slot-number: Clears IP packet statistics on the specified slot.
Description
Use the reset ip statistics command to clear statistics of IP packets.
Related commands: display ip interface and display ip statistics.
Examples
# Clear statistics of IP packets.
<Sysname> reset ip statistics
reset tcp statistics
Syntax
reset tcp statistics
View
User view
Default level
2: System level
Parameters
None
Description
Use the reset tcp statistics command to clear statistics of TCP traffic.
Related commands: display tcp statistics.
Examples
# Display statistics of TCP traffic.
<Sysname> reset tcp statistics
reset udp statistics
Syntax
reset udp statistics
View
User view
Default level
2: System level
Parameters
None
Description
Use the reset udp statistics command to clear statistics of UDP traffic.
Examples
# Display statistics of UDP traffic.
<Sysname> reset udp statistics
tcp mss
Syntax
tcp mss value
undo tcp mss
View
Interface view
Default level
2: System level
Parameters
value: TCP maximum segment size (MSS) in bytes, ranging from 128 to 2048.
Description
Use the tcp mss command to configure the TCP MSS.
Use the undo tcp mss command to restore the default.
By default, the TCP MSS is 1460 bytes.
As the default MTU on an interface is 1500 bytes, and there are link layer cost and IP packet header, so the recommended TCP MSS is about 1200 bytes.
Examples
# Set the TCP MSS to 300 bytes on GigabitEthernet 3/1/1.
<Sysname> system-view
[Sysname] interface GigabitEthernet 3/1/1
[Sysname-GigabitEthernet3/1/1] tcp mss 300
tcp timer fin-timeout
Syntax
tcp timer fin-timeout time-value
undo tcp timer fin-timeout
View
System view
Default level
2: System level
Parameters
time-value: Length of the TCP finwait timer in seconds, ranging from 76 to 3600.
Description
Use the tcp timer fin-timeout command to configure the length of the TCP finwait timer.
Use the undo tcp timer fin-timeout command to restore the default.
By default, the length of the TCP finwait timer is 675 seconds.
Note that the actual length of the finwait timer is determined by the following formula:
Actual length of the finwait timer = (Configured length of the finwait timer – 75) + configured length of the synwait timer
Related commands: tcp timer syn-timeout and tcp window.
Examples
# Set the length of the TCP finwait timer to 800 seconds.
<Sysname> system-view
[Sysname] tcp timer fin-timeout 800
tcp timer syn-timeout
Syntax
tcp timer syn-timeout time-value
undo tcp timer syn-timeout
View
System view
Default level
2: System level
Parameters
time-value: Length of the TCP finwait timer in seconds, ranging from 2 to 600.
Description
Use the tcp timer syn-timeout command to configure the length of the TCP synwait timer.
Use the undo tcp timer syn-timeout command to restore the default.
By default, the length of the TCP synwait timer is 75 seconds.
Related commands: tcp timer fin-timeout and tcp window.
Examples
# Set the length of the TCP synwait timer to 80 seconds.
<Sysname> system-view
[Sysname] tcp timer syn-timeout 80
tcp window
Syntax
tcp window window-size
undo tcp window
View
System view
Default level
2: System level
Parameters
window-size: Receiving/sending buffer size of TCP connection in KB, ranging from 1 to 32.
Description
Use the tcp window command to configure the receiving/sending buffer size of TCP connection.
Use the undo tcp window command to restore the default.
The TCP receiving/sending buffer is 8 KB by default.
Related commands: tcp timer fin-timeout and tcp timer syn-timeout.
Examples
# Configure the receiving/sending buffer of TCP connection as 3 KB.
<Sysname> system-view
[Sysname] tcp window 3
