Router on a stick

Post the IOS version in use and the commands that you tried to config

Well,

I got an email from Juan Carlos. I believe he has solved the mystery. Read his response below.

I am able to create the trunk link between the router and the switch now.

Regards,

Fred

From: "Juan Carlos" To: "Fred Atkinson" Sent: Wednesday, November 02, 2005 10:28 AM Subject: Re: Router on a stick

I set up the Router on a stick lab. I seem to have followed all the instructions. The weird thing is that the VLANs in the switch are showing adminstratively down.

I am showing the vlan status followed by the switch configuration followed by the router configuration. Can anyone tell me what is wrong?

Fred

VLAN interfaces in switch:

VLAN1 is up, line protocol is up Hardware is CPU Interface, address is 0004.27da.0980 (bia

0004.27da.0980) Internet address is 192.168.1.200/24 MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:47:28, output 00:54:15, 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 488 packets input, 51619 bytes, 0 no buffer Received 488 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 input packets with dribble condition detected 2 packets output, 120 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out VLAN2 is administratively down, line protocol is down Hardware is CPU Interface, address is 0004.27da.0980 (bia 0004.27da.0980) MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA ARP type: ARPA, ARP Timeout 04:00:00 VLAN3 is administratively down, line protocol is down Hardware is CPU Interface, address is 0004.27da.0980 (bia 0004.27da.0980) MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA ARP type: ARPA, ARP Timeout 04:00:00 VLAN4 is administratively down, line protocol is down Hardware is CPU Interface, address is 0004.27da.0980 (bia 0004.27da.0980) MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA ARP type: ARPA, ARP Timeout 04:00:00 VLAN5 is administratively down, line protocol is down Hardware is CPU Interface, address is 0004.27da.0980 (bia 0004.27da.0980) MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, reliability 255/255, txload 1/255, rxload 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 0004.27da.0981 (bia 0004.27da.0981) MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not set Auto-duplex (Full), Auto Speed (100), 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:24, output 00:00:00, 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 1000 bits/sec, 6 packets/sec 434 packets input, 52955 bytes Received 107 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 107 multicast 0 input packets with dribble condition detected 20219 packets output, 783079 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 FastEthernet0/2 is down, line protocol is down Hardware is Fast Ethernet, address is 0004.27da.0982 (bia 0004.27da.0982) 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 , Auto Speed , 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:47:43, 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 569 packets input, 60884 bytes Received 565 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 25 multicast 0 input packets with dribble condition detected 388 packets output, 19280 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 FastEthernet0/3 is down, line protocol is down Hardware is Fast Ethernet, address is 0004.27da.0983 (bia 0004.27da.0983) 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 , Auto Speed , 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:34:17, 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 296 packets input, 26764 bytes Received 295 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 857 packets output, 35880 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 FastEthernet0/4 is down, line protocol is down Hardware is Fast Ethernet, address is 0004.27da.0984 (bia 0004.27da.0984) MTU 1500 bytes, BW 0 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not set Auto-duplex , Auto Speed , 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:54:33, 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 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 7 packets output, 1192 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 FastEthernet0/5 is down, line protocol is down Hardware is Fast Ethernet, address is 0004.27da.0985 (bia 0004.27da.0985) MTU 1500 bytes, BW 0 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not set Auto-duplex , Auto Speed , 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:54:35, 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 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 7 packets output, 1192 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 FastEthernet0/6 is down, line protocol is down Hardware is Fast Ethernet, address is 0004.27da.0986 (bia 0004.27da.0986) MTU 1500 bytes, BW 0 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not set Auto-duplex , Auto Speed , 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:54:37, 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 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 7 packets output, 1192 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 FastEthernet0/7 is down, line protocol is down Hardware is Fast Ethernet, address is 0004.27da.0987 (bia 0004.27da.0987) MTU 1500 bytes, BW 0 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not set Auto-duplex , Auto Speed , 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:54:37, 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 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 8 packets output, 880 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 FastEthernet0/8 is down, line protocol is down Hardware is Fast Ethernet, address is 0004.27da.0988 (bia 0004.27da.0988) MTU 1500 bytes, BW 0 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not set Auto-duplex , Auto Speed , 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:54:39, 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 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 8 packets output, 880 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 FastEthernet0/9 is down, line protocol is down Hardware is Fast Ethernet, address is 0004.27da.0989 (bia 0004.27da.0989) MTU 1500 bytes, BW 0 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not set Auto-duplex , Auto Speed , 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:54:40, 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 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 8 packets output, 880 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 FastEthernet0/10 is down, line protocol is down Hardware is Fast Ethernet, address is 0004.27da.098a (bia 0004.27da.098a) MTU 1500 bytes, BW 0 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not set Auto-duplex , Auto Speed , 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:54:42, 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 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 8 packets output, 882 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 FastEthernet0/11 is down, line protocol is down Hardware is Fast Ethernet, address is 0004.27da.098b (bia 0004.27da.098b) MTU 1500 bytes, BW 0 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not set Auto-duplex , Auto Speed , 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:54:44, 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 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 8 packets output, 882 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 FastEthernet0/12 is down, line protocol is down Hardware is Fast Ethernet, address is 0004.27da.098c (bia 0004.27da.098c) MTU 1500 bytes, BW 0 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not set Auto-duplex , Auto Speed , 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:54:46, 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 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 8 packets output, 882 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 GigabitEthernet0/1 is down, line protocol is down Hardware is Gigabit Ethernet, address is 0004.27da.098d (bia 0004.27da.098d) 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 , link type is autonegotiation, media type is SX output flow-control is off, input flow-control is off ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:54:47, 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 watchdog, 0 multicast, 0 pause input 8 packets output, 896 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 pause output 0 output buffer failures, 0 output buffers swapped out GigabitEthernet0/2 is down, line protocol is down Hardware is Gigabit Ethernet, address is 0004.27da.098e (bia 0004.27da.098e) 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 , link type is autonegotiation, media type is SX output flow-control is off, input flow-control is off ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:54:49, 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 watchdog, 0 multicast, 0 pause input 8 packets output, 896 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 pause output 0 output buffer failures, 0 output buffers swapped out

Switch configuration

! version 12.0 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname Switch ! ! ! ! ! ! ! ip subnet-zero ! ! ! interface FastEthernet0/1 switchport access vlan 2 switchport trunk encapsulation dot1q switchport mode trunk ! interface FastEthernet0/2 ! interface FastEthernet0/3 switchport access vlan 2 spanning-tree portfast ! interface FastEthernet0/4 switchport access vlan 3 spanning-tree portfast ! interface FastEthernet0/5 switchport access vlan 4 spanning-tree portfast ! interface FastEthernet0/6 switchport access vlan 5 spanning-tree portfast ! interface FastEthernet0/7 switchport access vlan 2 ! interface FastEthernet0/8 switchport access vlan 3 ! interface FastEthernet0/9 switchport access vlan 4 ! interface FastEthernet0/10 switchport access vlan 5 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface GigabitEthernet0/1 ! interface GigabitEthernet0/2 ! interface VLAN1 ip address 192.168.1.200 255.255.255.0 no ip directed-broadcast no ip route-cache ! interface VLAN2 no ip directed-broadcast no ip route-cache shutdown ! interface VLAN3 no ip directed-broadcast no ip route-cache shutdown ! interface VLAN4 no ip directed-broadcast no ip route-cache shutdown ! interface VLAN5 no ip directed-broadcast no ip route-cache shutdown ! ip default-gateway 192.168.1.1 ! line con 0 transport input none stopbits 1 line vty 0 4 login line vty 5 15 login ! end

Router configuration

! version 12.2 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname Router ! logging queue-limit 100 ! ip subnet-zero ! ! ! ! call rsvp-sync ! ! ! ! ! ! ! ! interface FastEthernet0/0 no ip address shutdown duplex auto speed auto ! interface FastEthernet0/0.1 encapsulation dot1Q 1 native ip address 192.168.1.1 255.255.255.0 ! interface FastEthernet0/0.2 encapsulation dot1Q 2 ip address 192.168.2.1 255.255.255.0 ! interface FastEthernet0/0.3 encapsulation dot1Q 3 ip address 192.168.3.1 255.255.255.0 ! interface FastEthernet0/0.4 encapsulation dot1Q 4 ip address 192.168.4.1 255.255.255.0 ! interface FastEthernet0/0.5 encapsulation dot1Q 5 ip address 192.168.5.1 255.255.255.0 ! interface Serial0/0 no ip address shutdown ! interface FastEthernet0/1 ip address 192.168.0.1 255.255.255.0 duplex auto speed auto ! interface FastEthernet0/1.1 encapsulation dot1Q 1 native ! interface FastEthernet0/1.2 ! interface FastEthernet0/1.3 ! interface FastEthernet0/1.4 ! interface FastEthernet0/1.5 ! interface FastEthernet0/1.6 ! ip classless ip http server ! ! ! dial-peer cor custom ! ! ! ! ! line con 0 line aux 0 line vty 0 4 ! end

do a 'no shutdown' on each VLAN. they are default shutdown when you create them

I had already tried that. No luck.

Regards,

Fred

you should not have vlan interfaces on the switch (other than the one you choose to manage the switch by). in the global config no interface vlanx on all vlans except #1. Then (depending on the ios version) add the vlans you want to route using the "vlan" command or vlan database (not in config mode for db). If you create vlan interfaces on the switch, you are making layer 3 devices. You are trying to perform layer three functions on the router though, so there is no need for the interfaces on the switch. Also, only 1 vlan interface on the switch will ever go up up. All others will be admin down. The only exception to this is if you have a layer 3 switch and are routing in the switch itself.

Thanks to everyone who replied.

I have no explanation for it, but we did it in the lab (as opposed to the equipment in my office) and it worked fine for everyone who tried it, even me.

I did discover that most of the routers in the lab do not have the right IOS to support ROAST (Router on a Stick). I've opened a case with Cisco about the possibility of upgrading them to the best operating system for the lab instruction we provide.

Weird. I didn't have to spend all that time up to 10:45 PM working on it.

Regards,

Fred

There were IP addresses assigned to each subinterface. They were still shut down.

I move into the lab and started from scracth. Now it's running, but on only two of our routers. Apparently the IOS version is the issue.

Fred

If there weren't supposed to be VLAN interfaces on the switch, then how do I connect each PC to the switch?

Fred

The ports are assign to their respective vlan, i.e. "switchport access vlan n" Basically, when doing roast, you only need 1 vlan interface active. This allows ip management of the switch. Older switches use the vlan database (configured in enable mode, NOT config mode). Newer switches use the vlan n statement in config mode. Either way, you won't see the vlans defined in the configuration (exeception is CATOS). You will find them by "show vlan". They are stored in flash:vlan.dat. Which, btw, needs to be deleted whenever you want to slick a switch. You can wr erase, but the vlans will still be there.

Vlan interfaces on a switch are primarily for routing. A good example is a L3 6500 or even a 3550 with the smi or emi ios image. A 3550 with an emi image can be used as a very fast LAN router for instance. In this case, you would configure vlan interfaces and add the vlans to the database if they were not automatically created when adding the interface.

a simple roast config would look like so: router: interface fa0/0 no ip add speed 100 du full

interface fa0/0.10 encap dot1q 10 ip add 10.0.10.1 255.255.255.0

interface fa0/0.20 encap dot1q 20 ip add 10.0.20.1 255.255.255.0

switch: interface vlan 10 ip add 10.0.10.1 255.255.255.0 no shut

interface vlan 1 shut ! this is because it is defined by default

ip route 0.0.0.0 0.0.0 10.0.10.1

! non-configuration mode: vlan 10 name testvlan10 vlan 10 state active vlan 20 name testvlan20 vlan 20 state active

or

vlan database

Sorry for the long winded reply. Hope this helps.

correction: switch: interface vlan 10 ip add 10.0.10.2 255.255.255.0 no shut

Also, the port connected to the router would be hard code 100full and set to dot1q trunk

switchport trunk encap dot1q switchport mode trunk