There are a couple of ways of going about it. Let’s list the commands by the OS type.
- IOS
- IOS XE
- IOS XR
- JUNOS
P#show control-plane host open-ports
Active internet connections (servers and established)
Prot Local Address Foreign Address Service State
tcp *:23 *:0 Telnet LISTEN
tcp *:646 3.3.3.3:48989 LDP ESTABLIS
tcp *:62108 1.1.1.1:646 IOS host service ESTABLIS
udp *:3503 *:0 LSPV Echo LISTEN
P#ro-b-pe01#sh tcp brief
TCB Local Address Foreign Address (state)
7FF7ED7DCE20 10.10.255.3.18579 10.10.255.1.179 ESTAB
7FF7ED758AC8 10.10.255.3.34820 10.10.255.2.646 ESTAB
7FF7ED78E530 10.10.255.3.179 10.10.255.2.38666 ESTAB
7FF7ED757848 10.10.255.3.14828 10.10.255.1.646 ESTAB
ro-b-pe01#sh ip sockets
Proto Remote Port Local Port In Out Stat TTY OutputIF
17 --listen-- 10.10.255.3 646 0 0 2000001 0
17 --listen-- 10.10.255.3 3503 0 0 2000001 0
ro-b-pe01#RP/0/0/CPU0:ro-isp-rr01#sh tcp brief
Wed Aug 23 00:03:16.786 UTC
PCB VRF-ID Recv-Q Send-Q Local Address Foreign Address State
0x1215a64c 0x60000000 0 0 :::179 :::0 LISTEN
0x12156e94 0x00000000 0 0 :::179 :::0 LISTEN
0x1214c990 0x60000000 0 0 :::0 :::0 CLOSED
0x121490cc 0x00000000 0 0 :::0 :::0 CLOSED
0x1216304c 0x60000000 0 0 10.10.255.10:36385 10.10.255.1:179 ESTAB
0x1215efe0 0x60000000 0 0 10.10.255.10:29906 10.10.255.2:646 ESTAB
0x121643c8 0x60000000 0 0 10.10.255.10:16369 10.10.255.2:179 ESTAB
0x1215aca8 0x60000000 0 0 10.10.255.10:26965 10.10.255.1:646 ESTAB
0x1216ff18 0x60000000 0 0 10.10.255.10:19318 10.40.255.2:179 ESTAB
0x1213cc98 0x60000000 0 0 0.0.0.0:646 0.0.0.0:0 LISTEN
0x1213c3d4 0x00000000 0 0 0.0.0.0:646 0.0.0.0:0 LISTEN
0x12156acc 0x60000000 0 0 0.0.0.0:179 0.0.0.0:0 LISTEN
0x1215205c 0x00000000 0 0 0.0.0.0:179 0.0.0.0:0 LISTEN
0x1214db04 0x00000000 0 0 0.0.0.0:0 0.0.0.0:0 CLOSED
RP/0/0/CPU0:ro-isp-rr01#sh udp brief
Wed Aug 23 00:03:21.996 UTC
PCB VRF-ID Recv-Q Send-Q Local Address Foreign Address
0x12087e50 0x00000000 0 0 :::0 :::0
0x12080424 0x00000000 0 0 :::0 :::0
0x12084dd0 0x60000000 0 0 0.0.0.0:646 0.0.0.0:0
0x120849f0 0x00000000 0 0 0.0.0.0:646 0.0.0.0:0
0x120842d4 0x00000000 0 0 0.0.0.0:0 0.0.0.0:0
0x12080128 0x00000000 0 0 0.0.0.0:0 0.0.0.0:0
0x1207fb60 0x00000000 0 0 0.0.0.0:0 0.0.0.0:0
0x1207c464 0x00000000 0 0 0.0.0.0:0 0.0.0.0:0
RP/0/0/CPU0:ro-isp-rr01#Add your content here…
root@ro-is-rr02> show system connections
Active Internet connections (including servers)
Proto Recv-Q Send-Q Local Address Foreign Address (state)
tcp4 0 0 10.40.255.2.179 10.10.255.10.19318 ESTABLISHED
tcp4 0 0 10.40.255.2.59941 10.10.255.2.646 ESTABLISHED
tcp4 0 0 128.0.0.4.9000 128.0.0.4.63467 ESTABLISHED
tcp4 0 0 128.0.0.4.63467 128.0.0.4.9000 ESTABLISHED
tcp46 0 0 *.179 *.* LISTEN
tcp4 0 0 *.179 *.* LISTEN
tcp4 0 0 127.0.0.1.61256 127.0.0.1.2606 ESTABLISHED
tcp4 0 0 *.32003 *.* LISTEN
tcp4 0 0 *.646 *.* LISTEN
tcp4 0 0 *.51627 *.* LISTEN
tcp4 0 0 *.6152 *.* LISTEN
tcp4 0 0 *.23 *.* LISTEN
tcp4 0 0 *.514 *.* LISTEN
udp46 0 0 *.514 *.*
udp4 0 0 *.514 *.*
udp4 0 0 *.* *.*
udp4 0 0 *.* *.*For more information, when someone uses the ‘show tcp brief’ command, they can use the ‘show tcp tcb tcb_number’ command.
ro-b-rr01#sh tcp brief
TCB Local Address Foreign Address (state)
65AF595C 10.10.255.1.29901 10.10.255.4.179 ESTAB
65B131C4 10.10.255.1.646 10.10.255.10.61379 ESTAB
65B124A8 10.10.255.1.179 10.10.255.10.32547 ESTAB
65AF41B8 10.10.255.1.646 10.10.255.4.47222 ESTAB
681AB1E8 10.10.255.1.646 10.10.255.2.53071 ESTAB
ro-b-rr01#sh tcp tcb 65AF595C
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Connection is ECN Disabled
Mininum incoming TTL 0, Outgoing TTL 255
Local host: 10.10.255.1, Local port: 29901
Foreign host: 10.10.255.4, Foreign port: 179
Connection tableid (VRF): 0
Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)
Event Timers (current time is 0x753F8):
Timer Starts Wakeups Next
Retrans 8 0 0x0
TimeWait 0 0 0x0
AckHold 8 7 0x0
SendWnd 0 0 0x0
KeepAlive 0 0 0x0
GiveUp 0 0 0x0
PmtuAger 1 0 0xBEB68
DeadWait 0 0 0x0
Linger 0 0 0x0
iss: 1153422846 snduna: 1153423167 sndnxt: 1153423167 sndwnd: 16064
irs: 2640728826 rcvnxt: 2640729166 rcvwnd: 16045 delrcvwnd: 339
SRTT: 197 ms, RTTO: 984 ms, RTV: 787 ms, KRTT: 0 ms
minRTT: 4 ms, maxRTT: 300 ms, ACK hold: 200 ms
Status Flags: none
Option Flags: higher precendence, nagle, path mtu capable
Datagrams (max data segment is 1436 bytes):
Rcvd: 17 (out of order: 0), with data: 9, total data bytes: 339
Sent: 17 (retransmit: 0 fastretransmit: 0),with data: 8, total data bytes: 320
ro-b-rr01#Same deal for IOS XR. The command slightly differs: ‘show udp detail pcb pcb_number’. Same logic for TCP.
RP/0/0/CPU0:ro-isp-rr01#show udp brief
Thu Aug 24 21:10:09.307 UTC
PCB VRF-ID Recv-Q Send-Q Local Address Foreign Address
0x1207cc14 0x00000000 0 0 :::0 :::0
0x12078578 0x00000000 0 0 :::0 :::0
0x1207ba54 0x60000000 0 0 0.0.0.0:646 0.0.0.0:0
0x1207bf70 0x00000000 0 0 0.0.0.0:646 0.0.0.0:0
0x12077a14 0x00000000 0 0 0.0.0.0:0 0.0.0.0:0
0x1207463c 0x00000000 0 0 0.0.0.0:0 0.0.0.0:0
0x12077844 0x00000000 0 0 0.0.0.0:0 0.0.0.0:0
0x12074064 0x00000000 0 0 0.0.0.0:0 0.0.0.0:0
RP/0/0/CPU0:ro-isp-rr01#show udp detail pcb 0x1207ba54
Thu Aug 24 21:10:25.516 UTC
===============================================
PCB is 0x1207ba54, Family: 2, VRF: 0x60000000
Local host: 0.0.0.0:646 (Local App PID: 663796)
Foreign host: 0.0.0.0:0
Current send queue size: 0
Current receive queue size: 0
RP/0/0/CPU0:ro-isp-rr01#