{"id":2625,"date":"2016-02-28T22:50:23","date_gmt":"2016-02-29T03:50:23","guid":{"rendered":"http:\/\/microdevsys.com\/wp\/?p=2625"},"modified":"2019-12-14T00:07:25","modified_gmt":"2019-12-14T05:07:25","slug":"configuring-cisco-switch-3750g-poe","status":"publish","type":"post","link":"https:\/\/microdevsys.com\/wp\/configuring-cisco-switch-3750g-poe\/","title":{"rendered":"Configuring Cisco Switch 3750G POE"},"content":{"rendered":"

\n\tThis is a set of running notes on configuring a Cisco 3750G POE Switch.  It's very very messy and is meant for me to remember the ins and outs of doing this.  Along the way, it could help someone else too.\n<\/p>\n

\n\tFirst use a console connection to your switch.  The console is unaffected by what we do on the ports so for initial configuration, this is what is recommended.  You'll need a DB9 to RS-232 Cable however some wiring of the DB9 may be needed so it is highly recommended you do that.  Search for the pin placements of a DB9 to an RS-232 for a Cisco switch on this blog.  If all connected well, you'll be rewarded with a nice cold busybox prompt.  Cisco default settings are:\n<\/p>\n

\n\t\n<\/p>\n

\r\nBits per sec    :  9600 \r\nData bits       :     8 \r\nParity          :  none \r\nStop bits       :     1 \r\nFlow control    :  none <\/pre>\n
\n\tIn windows go to Device Manager vi a navigation gauntlet to find the COM?<\/strong> port you need for putty while in linux run ls -altri \/dev\/ttyUSB*<\/strong> to determine the serial port (If you're using a Serial to USB RS-232<\/strong>).  Your reward will be:\n<\/p>\n
\n\tmdscisco01>
\n\tmdscisco01><\/span>\n<\/p>\n
\n\tThis is good.  On to the fun stuff.  At this point your best friend is the <\/span>?<\/strong> charater.  It will show you the help with which you can remember things and get started on.  Turn on previlidged commands.  We'll do most of our work through here:<\/span>\n<\/p>\n
\n\tmdscisco01>enable
\n\tmdscisco01#<\/span>\n<\/p>\n
\n\tNot bad.  Now we'll use this list of commands to get by and configure it the way we like.\n<\/p>\n
\n\tmdscisco01#conf t
\n\tEnter configuration commands, one per line.  End with CNTL\/Z.
\n\tmdscisco01(config)#<\/span>\n<\/p>\n
\n\tmdscisco01(config)#int GigabitEthernet1\/0\/28
\n\tmdscisco01(config-if)#<\/span>\n<\/p>\n
\n\tmdscisco01#show ip int brief
\n\tInterface              IP-Address      OK? Method Status                Protocol
\n\tVlan1                  192.168.0.3     YES NVRAM  up                    down
\n\tGigabitEthernet1\/0\/1   unassigned      YES unset  down                  down<\/span><\/span>\n<\/p>\n
\n\tmdscisco01#sh vlan<\/span>\n<\/p>\n
\n\tcreate some VLAN's that we can use later (not necessary but handy)\n<\/p>\n
\n\tmdscisco01(config)#vlan 1,40-50,60-70,100,200<\/span>\n<\/p>\n
\n\twell never mind so let's remove these VLAN's  (At least now you know the syntax for it.  Later we will enable them on a port range.):\n<\/p>\n
\n\tmdscisco01(config)#no vlan 40-50,60-70,100,200
\n\tmdscisco01(config)#<\/span>\n<\/p>\n
\n\tSet an IP \/ Gateway on VLAN 1 on the switch (Unremovable VLAN)\n<\/p>\n
\n\tmdscisco01#conf t
\n\tEnter configuration commands, one per line.  End with CNTL\/Z.
\n\tmdscisco01(config)#int vlan 1
\n\tmdscisco01(config-if)#ip address 192.168.0.3 255.255.255.0
\n\tmdscisco01(config-if)#no shut
\n\tmdscisco01(config-if)#
\n\t01:00:25: %LINK-3-UPDOWN: Interface Vlan1, changed state to up
\n\tmdscisco01(config-if)#end
\n\tmdscisco01#
\n\t01:00:31: %SYS-5-CONFIG_I: Configured from console by console
\n\tmdscisco01#conf t
\n\tEnter configuration commands, one per line.  End with CNTL\/Z.
\n\tmdscisco01(config)#int vlan 1
\n\tmdscisco01(config-if)#ip default-gateway 192.168.0.1
\n\tmdscisco01(config)#ip default-gateway 192.168.0.1
\n\tmdscisco01(config)#end
\n\tmdscisco01#
\n\t01:02:36: %SYS-5-CONFIG_I: Configured from console by console
\n\tmdscisco01#show int vlan 1
\n\tVlan1 is up, line protocol is down
\n\t  Hardware is EtherSVI, address is 001c.57ae.f840 (bia 001c.57ae.f840)
\n\t  Internet address is 192.168.0.3\/24
\n\t  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
\n\t     reliability 255\/255, txload 1\/255, rxload 1\/255
\n\t  Encapsulation ARPA, loopback not set
\n\t  Keepalive not supported
\n\t  ARP type: ARPA, ARP Timeout 04:00:00
\n\t  Last input never, output 00:02:24, output hang never
\n\t  Last clearing of "show interface" counters never
\n\t  Input queue: 0\/75\/0\/0 (size\/max\/drops\/flushes); Total output drops: 0
\n\t  Queueing strategy: fifo
\n\t  Output queue: 0\/40 (size\/max)
\n\t  5 minute input rate 0 bits\/sec, 0 packets\/sec
\n\t  5 minute output rate 0 bits\/sec, 0 packets\/sec
\n\t     0 packets input, 0 bytes, 0 no buffer
\n\t     Received 0 broadcasts (0 IP multicasts)
\n\t     0 runts, 0 giants, 0 throttles
\n\t     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
\n\t     22 packets output, 1459 bytes, 0 underruns
\n\t     0 output errors, 1 interface resets
\n\t     0 output buffer failures, 0 output buffers swapped out
\n\tmdscisco01#<\/span>\n<\/p>\n
\n\tNext we will test the connectivity of our switch to the rest of the network. (Second comment UPDOWN is Amber light and third UPDOWN is Green light on the switch ports to which a cable is connected. )\n<\/p>\n
\n\tmdscisco01#
\n\t01:06:42: %LINK-3-UPDOWN: Interface GigabitEthernet1\/0\/13, changed state to up
\n\t01:06:43: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1\/0\/13, changed state to up
\n\tmdscisco01#
\n\t01:07:11: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up
\n\tmdscisco01#<\/span>\n<\/p>\n
\n\tAnd validate the ping to some of the equipment you have:\n<\/p>\n
\n\t \n<\/p>\n
\n\tmdscisco01#ping 192.168.0.152
\n\tType escape sequence to abort.<\/span>
\n\tSending 5, 100-byte ICMP Echos to 192.168.0.152, timeout is 2 seconds:<\/span>
\n\t!!!!!<\/span>
\n\tSuccess rate is 100 percent (5\/5), round-trip min\/avg\/max = 1\/203\/1007 ms<\/span>
\n\tmdscisco01#<\/span><\/span>\n<\/p>\n
\n\tNow let's set the password<\/a> to enable SSH \/ Telnet Login:\n<\/p>\n
\n\tmdscisco01(config)#enable secret <halbhalb>
\n\tmdscisco01(config)#enable password <halbhalb><\/strong>
\n\tThe enable password you have chosen is the same as your enable secret.
\n\tThis is not recommended.  Re-enter the enable password.<\/span>\n<\/p>\n
\n\tmdscisco01(config)#
\n\tmdscisco01(config)#
\n\tmdscisco01(config)#enable password <blahblah>
\n\tmdscisco01(config)#end<\/strong><\/span>\n<\/p>\n
\n\tSometimes an interface misbehaves so we can shut it down until we investigate what's wrong:\n<\/p>\n
\n\tmdscisco01#conf t<\/strong>
\n\tEnter configuration commands, one per line.  End with CNTL\/Z.
\n\tmdscisco01(config)#int gigabitethernet1\/0\/3<\/strong>
\n\tmdscisco01(config-if)#
\n\tmdscisco01(config-if)#shut<\/strong>
\n\tmdscisco01(config-if)#
\n\t02:45:45: %LINK-5-CHANGED: Interface GigabitEthernet1\/0\/3, changed state to administratively down
\n\t02:45:46: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1\/0\/3, changed state to down
\n\tmdscisco01(config-if)#
\n\tmdscisco01(config-if)#
\n\tmdscisco01#show interface gigabitethernet1\/0\/3<\/strong>
\n\tGigabitEthernet1\/0\/3 is administratively down, line protocol is down (disabled<\/span>)
\n\t  Hardware is Gigabit Ethernet, address is 001c.57ae.f803 (bia 001c.57ae.f803)
\n\t  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
\n\t     reliability 255\/255, txload 1\/255, rxload 1\/255
\n\t  Encapsulation ARPA, loopback not set
\n\t  Keepalive set (10 sec)
\n\t  Auto-duplex, Auto-speed, media type is 10\/100\/1000BaseTX
\n\t  input flow-control is off, output flow-control is unsupported
\n\t  ARP type: ARPA, ARP Timeout 04:00:00
\n\t  Last input never, output 00:05:26, output hang never
\n\t  Last clearing of "show interface" counters never
\n\t  Input queue: 0\/75\/0\/0 (size\/max\/drops\/flushes); Total output drops: 0
\n\t  Queueing strategy: fifo
\n\t  Output queue: 0\/40 (size\/max)
\n\t  5 minute input rate 0 bits\/sec, 0 packets\/sec
\n\t  5 minute output rate 0 bits\/sec, 0 packets\/sec
\n\t     0 packets input, 0 bytes, 0 no buffer
\n\t     Received 0 broadcasts (0 multicasts)
\n\t     0 runts, 0 giants, 0 throttles
\n\t     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
\n\t     0 watchdog, 0 multicast, 0 pause input
\n\t     0 input packets with dribble condition detected
\n\t     26815 packets output, 3035941 bytes, 0 underruns
\n\t     0 output errors, 0 collisions, 2 interface resets
\n\t     0 babbles, 0 late collision, 0 deferred
\n\t     0 lost carrier, 0 no carrier, 0 PAUSE output
\n\t     0 output buffer failures, 0 output buffers swapped out
\n\tmdscisco01#<\/span><\/span>\n<\/p>\n
\n\tIf your configuration is working, don't forget to save it:\n<\/p>\n
\n\tmdscisco01#copy running-config startup-config
\n\tDestination filename [startup-config]?
\n\tBuilding configuration…
\n\t[OK]
\n\tmdscisco01#<\/span>\n<\/p>\n
\n\tIf you get:\n<\/p>\n
\n\tPassword required, but none set<\/span>\n<\/p>\n
\n\tIt's time to set a password for your Cisco switch:\n<\/p>\n
\n\tmdscisco01#conf t
\n\tEnter configuration commands, one per line.  End with CNTL\/Z.
\n\tmdscisco01(config)#aaa
\n\t% Incomplete command.<\/span>\n<\/p>\n
\n\tmdscisco01(config)#aaa new-model
\n\tmdscisco01(config)#aaa authentication login default local<\/span>
\n\tmdscisco01(config)#<\/span>aaa authentication enable default enable<\/span>
\n\tmdscisco01(config)#username <USER> password <SECRET><\/span>
\n\tmdscisco01(config)#enable secret <USER><\/span>
\n\tmdscisco01(config)#end<\/span>
\n\tmdscisco01#<\/span>
\n\t03:51:16: %SYS-5-CONFIG_I: Configured from console by console<\/span>
\n\tmdscisco01#<\/span>\n<\/p>\n
\n\tAnd then you need to go back above and enable secret <SECRET><\/strong> followed by enable password <PASSWORD><\/strong> \n<\/p>\n
\n\tTo discover IP's mapped to their MAC addresses, use these commands:\n<\/p>\n
\n\tmdscisco01# show mac-address-table
\n\tmdscisco01# show arp
\n\tmdscisco01# sh ip arp
\n\tmdscisco01#sh int gig 1\/0\/2   # Short Form<\/span>\n<\/p>\n
\n\tOn initial login through SSH, use the default password:\n<\/p>\n
\n\tN: cisco
\n\tP: cisco or pass you've set<\/strong>\n<\/p>\n
\n\tGood stuff!  \n<\/p>\n
\n\tCheers,
\n\tTK\n<\/p>\n
\n\tREF: https:\/\/www.cisco.com\/c\/en\/us\/td\/docs\/switches\/lan\/catalyst4500\/12-2\/31sg\/configuration\/guide\/conf\/connect.pdf<\/a>\n<\/p>\n
\n\t <\/p>\n\n    
\n\n\t\t\n        
    \n\t\t\t        <\/ul>\n    <\/div> \n","protected":false},"excerpt":{"rendered":"
    This is a set of running notes on configuring a Cisco 3750G POE Switch.  It's very very messy and is meant for me to remember the ins and outs of doing this.  Along the way, it could help someone else too. First use a console connection to your switch.  The console is unaffected by what […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[3],"tags":[],"class_list":["post-2625","post","type-post","status-publish","format-standard","hentry","category-unix-linux-admin-stuff"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/microdevsys.com\/wp\/wp-json\/wp\/v2\/posts\/2625","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/microdevsys.com\/wp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/microdevsys.com\/wp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/microdevsys.com\/wp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/microdevsys.com\/wp\/wp-json\/wp\/v2\/comments?post=2625"}],"version-history":[{"count":5,"href":"https:\/\/microdevsys.com\/wp\/wp-json\/wp\/v2\/posts\/2625\/revisions"}],"predecessor-version":[{"id":5061,"href":"https:\/\/microdevsys.com\/wp\/wp-json\/wp\/v2\/posts\/2625\/revisions\/5061"}],"wp:attachment":[{"href":"https:\/\/microdevsys.com\/wp\/wp-json\/wp\/v2\/media?parent=2625"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/microdevsys.com\/wp\/wp-json\/wp\/v2\/categories?post=2625"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/microdevsys.com\/wp\/wp-json\/wp\/v2\/tags?post=2625"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}