Switch Control
Manuals
3750 reference http://www.cisco.com/en/US/products/hw/switches/ps5023/products_command_reference_chapter09186a00801f5ffb.html#2789851
Finding which IPs are on a port
If you need to find out which IPs are on a particular port, start by finding out what mac addresses are on which port:
switch-p1> en switch-p1#show mac-address-table Dynamic Address Count: 53 Secure Address (User-defined) Count: 0 Static Address (User-defined) Count: 0 System Self Address Count: 48 Total MAC addresses: 101 Maximum MAC addresses: 2048 Non-static Address Table: Destination Address Address Type VLAN Destination Port ------------------- ------------ ---- -------------------- 0002.b315.3201 Dynamic 1 FastEthernet0/8 0002.b3a6.f354 Dynamic 1 FastEthernet0/1 0002.b3bb.45fe Dynamic 1 FastEthernet0/7 0002.b3e9.226b Dynamic 1 FastEthernet0/4 0002.b3e9.868c Dynamic 1 FastEthernet0/13 0002.b9b1.4c01 Dynamic 1 FastEthernet0/24 0004.75a1.91f1 Dynamic 1 FastEthernet0/24 0006.5b3d.80fb Dynamic 1 FastEthernet0/1 0006.d78a.c798 Dynamic 1 FastEthernet0/1 0007.e90d.e4c9 Dynamic 1 FastEthernet0/24 0007.e95b.c645 Dynamic 1 FastEthernet0/1 000c.f1d3.a7f9 Dynamic 1 FastEthernet0/1 000c.f1dc.f1ce Dynamic 1 FastEthernet0/3 000c.f1fa.71d7 Dynamic 1 FastEthernet0/24 000d.56fe.ad72 Dynamic 1 FastEthernet0/24 000e.0c59.c1a6 Dynamic 3 FastEthernet0/22 000f.1f64.43bc Dynamic 1 FastEthernet0/24 0010.e002.473b Dynamic 1 FastEthernet0/24 0011.0924.1d91 Dynamic 1 FastEthernet0/15 0011.1108.58a6 Dynamic 1 FastEthernet0/24 0011.1119.791e Dynamic 1 FastEthernet0/24 0020.ed91.f85d Dynamic 1 FastEthernet0/1 0030.4828.9d50 Dynamic 1 FastEthernet0/1 0030.4841.5246 Dynamic 1 FastEthernet0/5 0030.4870.8332 Dynamic 1 FastEthernet0/1 0030.4870.8898 Dynamic 1 FastEthernet0/1 0030.4871.b911 Dynamic 1 FastEthernet0/23 0050.455b.b27e Dynamic 1 FastEthernet0/14 0050.50be.f9c8 Dynamic 3 FastEthernet0/22 0060.089a.8f70 Dynamic 1 FastEthernet0/24 0090.27f9.0abf Dynamic 1 FastEthernet0/2 0090.27f9.1b53 Dynamic 1 FastEthernet0/24 00b0.d020.b557 Dynamic 1 FastEthernet0/9 00b0.d020.df60 Dynamic 1 FastEthernet0/1 00b0.d020.fc4a Dynamic 1 FastEthernet0/1 00b0.d049.125b Dynamic 1 FastEthernet0/1 00b0.d049.16a4 Dynamic 1 FastEthernet0/1 00b0.d049.98e4 Dynamic 1 FastEthernet0/24 00b0.d049.a43e Dynamic 1 FastEthernet0/24 00b0.d049.d03c Dynamic 1 FastEthernet0/1 00b0.d049.d61f Dynamic 1 FastEthernet0/1 00b0.d049.e643 Dynamic 1 FastEthernet0/1 00b0.d068.1911 Dynamic 1 FastEthernet0/10 00b0.d068.490b Dynamic 1 FastEthernet0/24 001e.c95a.d225 Dynamic 1 FastEthernet0/12 00b0.d068.7599 Dynamic 1 FastEthernet0/24 00b0.d068.8451 Dynamic 1 FastEthernet0/6 00b0.d0b0.306b Dynamic 1 FastEthernet0/1 00b0.d0b0.4020 Dynamic 1 FastEthernet0/11 00b0.d0b0.70bd Dynamic 1 FastEthernet0/1 00b0.d0b0.c5a4 Dynamic 1 FastEthernet0/1 00b0.d0b0.f533 Dynamic 1 FastEthernet0/24 0800.20c2.1de3 Dynamic 3 FastEthernet0/22
Let's say you want to know what IP's are on port 12. We see the mac address is 001e.c95a.d225 If we look that up in the router we can find the arp'd IP on that mac address:
Castle (3750):
E-mon-3750>en E-mon-3750#show arp | include 001e.c95a.d225 Internet 69.55.228.149 39 001e.c95a.d225 ARPA Vlan50 Internet 69.55.228.137 39 001e.c95a.d225 ARPA Vlan50 Internet 69.55.238.164 39 001e.c95a.d225 ARPA Vlan50 Internet 69.55.228.172 38 001e.c95a.d225 ARPA Vlan50 Internet 69.55.228.212 40 001e.c95a.d225 ARPA Vlan50 Internet 69.55.238.212 39 001e.c95a.d225 ARPA Vlan50 Internet 69.55.228.196 25 001e.c95a.d225 ARPA Vlan50 Internet 69.55.234.24 38 001e.c95a.d225 ARPA Vlan50 Internet 69.55.234.25 40 001e.c95a.d225 ARPA Vlan50 Internet 69.55.234.27 39 001e.c95a.d225 ARPA Vlan50 Internet 69.55.234.30 34 001e.c95a.d225 ARPA Vlan50 Internet 69.55.234.31 26 001e.c95a.d225 ARPA Vlan50 Internet 69.55.234.16 40 001e.c95a.d225 ARPA Vlan50 Internet 69.55.234.19 39 001e.c95a.d225 ARPA Vlan50 Internet 69.55.236.18 38 001e.c95a.d225 ARPA Vlan50 Internet 69.55.236.14 23 001e.c95a.d225 ARPA Vlan50 Internet 69.55.234.14 40 001e.c95a.d225 ARPA Vlan50 Internet 69.55.234.15 42 001e.c95a.d225 ARPA Vlan50 Internet 69.55.234.3 53 001e.c95a.d225 ARPA Vlan50 Internet 69.55.234.5 40 001e.c95a.d225 ARPA Vlan50 Internet 69.55.234.6 26 001e.c95a.d225 ARPA Vlan50 Internet 69.55.234.57 38 001e.c95a.d225 ARPA Vlan50 Internet 69.55.230.53 38 001e.c95a.d225 ARPA Vlan50
And we can look at some of these IPs and we quickly realize that they all belong to jail2 and if we look at jail2 we also see the correlation with the mac (ether 00:1e:c9:5a:d2:25):
jail2 /root# ifconfig
bce0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=1bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4>
ether 00:1e:c9:5a:d2:27
inet 10.1.4.102 netmask 0xffffff00 broadcast 10.1.4.255
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
bce1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=1bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4>
ether 00:1e:c9:5a:d2:25
inet 69.55.228.53 netmask 0xffffff00 broadcast 69.55.228.255
inet 69.55.227.56 netmask 0xffffff00 broadcast 69.55.227.255
inet 69.55.227.57 netmask 0xffffffff broadcast 69.55.227.57
inet 69.55.227.58 netmask 0xffffffff broadcast 69.55.227.58
inet 69.55.227.59 netmask 0xffffffff broadcast 69.55.227.59
inet 69.55.227.60 netmask 0xffffffff broadcast 69.55.227.60
-SNIP-
If we are doing the lookup at i2b:
firewall2 /usr/home/user# arp -a | grep 00:0c:29:be:0f:e3 ? (69.55.229.150) at 00:0c:29:be:0f:e3 on bge1 [ethernet] firewall2 /usr/home/user#
Note how we have to format the mac address differently than we do on a cisco switch.
The same search works in reverse. Let's say you have an IP and you want to know which port it's on. First lookup the IP:
Castle:
E-mon-3750#show arp | include 69.55.227.4 Internet 69.55.227.4 78 0030.4828.9d50 ARPA Vlan50 Internet 69.55.227.49 0 Incomplete ARPA Internet 69.55.227.48 0 Incomplete ARPA Internet 69.55.227.41 0 Incomplete ARPA Internet 69.55.227.40 0 Incomplete ARPA Internet 69.55.227.43 0 Incomplete ARPA Internet 69.55.227.42 0 Incomplete ARPA Internet 69.55.227.45 0 Incomplete ARPA Internet 69.55.227.44 0 Incomplete ARPA Internet 69.55.227.47 179 001e.c95a.d54f ARPA Vlan50 Internet 69.55.227.46 0 Incomplete ARPA E-mon-3750#
i2b:
firewall2 /usr/home/user# arp -a | grep 69.55.229.156 ? (69.55.229.156) at 00:15:17:da:2e:fb on bge1 [ethernet]
So we take that mac (e.x. 0030.4828.9d50) and on each of our switches we run:
switch-p1> en switch-p1#show mac-address-table | include 0030.4828.9d50
until we find the port. Note, some ios's may not let you run the include command, if so just run show mac-address-table without the include
Controlling port speed
Quick commands, speed 10Mbps:
enable configure terminal interface fastEthernet 0/17 speed 10 exit exit
Set to 100Mbps:
enable configure terminal interface fastEthernet 0/12 speed 100 exit exit
Set to Auto (default):
enable configure terminal interface fastEthernet 0/12 speed auto exit exit
Sample output: switch-p1>enable switch-p1#show interfaces fastEthernet 0/12 switch-p1#sh int FastEthernet0/12 FastEthernet0/12 is down, line protocol is down
Hardware is Fast Ethernet, address is 0002.b9b1.4c0c (bia 0002.b9b1.4c0c)
MTU 1500 bytes, BW 0 Kbit, DLY 0 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Auto-duplex , 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 5w6d, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
1126 packets input, 1574484 bytes
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast
0 input packets with dribble condition detected
779 packets output, 54919 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
switch-p1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. switch-p1(config)#interface fastEthernet 0/12 switch-p1(config-if)#speed 10 switch-p1(config-if)#exit switch-p1(config)#exit switch-p1#sh int FastEthernet0/12 FastEthernet0/12 is down, line protocol is down
Hardware is Fast Ethernet, address is 0002.b9b1.4c0c (bia 0002.b9b1.4c0c)
MTU 1500 bytes, BW 0 Kbit, DLY 0 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Auto-duplex , 10Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 5w6d, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
1126 packets input, 1574484 bytes
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast
0 input packets with dribble condition detected
779 packets output, 54919 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
switch-p1#
Shutting down a port
Quick commands:
enable configure terminal interface fastEthernet 0/17 shutdown exit exit
Turn back on:
enable configure terminal interface fastEthernet 0/17 no shutdown exit exit
Sample output:
switch-p1>enable
switch-p1#show interfaces fastEthernet 0/17
FastEthernet0/17 is down, line protocol is down
Hardware is Fast Ethernet, address is 0050.d1d8.94d1 (bia 0050.d1d8.94d1)
MTU 1500 bytes, BW 0 Kbit, DLY 100 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set, keepalive not set
Duplex setting unknown, Unknown Speed, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
1 packets input, 64 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 watchdog, 0 multicast
0 input packets with dribble condition detected
1 packets output, 64 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
switch-p1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
switch-p1(config)#interface fastEthernet 0/17
switch-p1(config-if)#shutdown
%LINK-5-CHANGED: Interface FastEthernet0/17, changed state to administratively down
switch-p1(config-if)#no shutdown
%LINK-3-UPDOWN: Interface FastEthernet0/17, changed state to up
%LINK-3-UPDOWN: Interface FastEthernet0/17, changed state to down
switch-p1(config-if)#exit
switch-p1(config)#exit
switch-p1#
Show port stats
For one port:
switch-p1> en
switch-p1#show int FastEthernet0/7
FastEthernet0/7 is up, line protocol is up
Hardware is Fast Ethernet, address is 0050.d1d8.94c7 (bia 0050.d1d8.94c7)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set, keepalive not set
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:02, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 9000 bits/sec, 20 packets/sec
137101258 packets input, 2869037621 bytes, 0 no buffer
Received 326 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 26 ignored, 0 abort
0 watchdog, 0 multicast
0 input packets with dribble condition detected
330219386 packets output, 3304714878 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
For all ports:
switch-p1> en
switch-p1#show interfaces
VLAN1 is up, line protocol is down
Hardware is CPU Interface, address is 0050.d1d8.94c0 (bia 0050.d1d8.94c0)
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set, keepalive not set
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:10, output 00:00:10, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
137465 packets input, 10297233 bytes, 0 no buffer
Received 89751 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 302 ignored, 0 abort
0 input packets with dribble condition detected
52396 packets output, 6878747 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
VLAN3 is up, line protocol is up
Hardware is CPU Interface, address is 0050.d1d8.94c0 (bia 0050.d1d8.94c0)
Internet address is 10.1.4.5/24
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
Encapsulation ARPA
ARP type: ARPA, ARP Timeout 04:00:00
FastEthernet0/1 is up, line protocol is up
Hardware is Fast Ethernet, address is 0050.d1d8.94c1 (bia 0050.d1d8.94c1)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, rely 255/255, load 3/255
Encapsulation ARPA, loopback not set, keepalive not set
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:37, output 00:00:53, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 4593000 bits/sec, 762 packets/sec
5 minute output rate 1240000 bits/sec, 689 packets/sec
260548696 packets input, 2531757155 bytes, 0 no buffer
Received 22173 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 333 ignored, 0 abort
0 watchdog, 2942 multicast
0 input packets with dribble condition detected
241281983 packets output, 3622221090 bytes, 0 underruns
0 output errors, 0 collisions, 15 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
FastEthernet0/2 is up, line protocol is up
Hardware is Fast Ethernet, address is 0050.d1d8.94c2 (bia 0050.d1d8.94c2)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set, keepalive not set
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:54, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 146000 bits/sec, 108 packets/sec
5 minute output rate 98000 bits/sec, 114 packets/sec
22830604 packets input, 905395220 bytes, 0 no buffer
Received 9845 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 10 ignored, 0 abort
0 watchdog, 3 multicast
0 input packets with dribble condition detected
23910838 packets output, 3702256298 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
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