Solved: Layer 2 Switching

girish.patni · ‎05-09-2012

I am using a switch(3560X) and a router 7606 for the given setup.

I am doing a simple simulation of attcaching a port (on 7606 router)to the switch and testing it with various speed ,duplex setting.

The switch port is in vlan 2 with ip address x.x.x.234 mask 255.255.255.0

and the attached router port has ip address x.x.x.235 mask 255.255.255.0

The problem is:

The connection is establises for duplex full,speed 1000

but it does not establish for duplex full,speed 100

and duplex half,speed 10.

The ports are 10/100/1000 Ethernet ports.

The output from 3560 is:

3560X#sh int gig 0/10

GigabitEthernet0/10 is down, line protocol is down (notconnect)

Hardware is Gigabit Ethernet, address is 442b.0389.448a (bia 442b.0389.448a)

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Half-duplex, 10Mb/s, media type is 10/100/1000BaseTX

input flow-control is off, output flow-control is unsupported

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:35:39, output 00:35:09, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

3560X#sh run int gig 0/10

Current configuration : 129 bytes

!

interface GigabitEthernet0/10

switchport access vlan 2

switchport mode access

speed 10

duplex half

end

################################################ #######################################

3560X#sh int gig 0/10

GigabitEthernet0/10 is up, line protocol is up (connected)

Hardware is Gigabit Ethernet, address is 442b.0389.448a (bia 442b.0389.448a)

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX

input flow-control is off, output flow-control is unsupported

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:03, output 00:00:01, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

3560X#sh run int gig 0/10

Current configuration : 131 bytes

!

interface GigabitEthernet0/10

switchport access vlan 2

switchport mode access

speed 1000

duplex full

end

And Output from the 7606 link is :

7606-A#sh run int gig 2/10

!

interface GigabitEthernet2/10

ip address 192.168.0.235 255.255.255.0

speed 10

duplex half

end

7606-A#sh int gig 2/10

GigabitEthernet2/10 is down, line protocol is down (notconnect)

Hardware is C6k 1000Mb 802.3, address is 0011.bbb1.a140 (bia 0011.bbb1.a140)

Internet address is 192.168.0.235/24

MTU 1500 bytes, BW 10000 Kbit, DLY 10 usec,

reliability 255/255, txload 0/255, rxload 0/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Half-duplex, 10Mb/s, media type is 10/100/1000BaseT

input flow-control is off, output flow-control is off

Clock mode is auto

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:25:11, output 00:25:10, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/59/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

L2 Switched: ucast: 1619 pkt, 103616 bytes - mcast: 4238 pkt, 311393 bytes

L3 in Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes mcast

L3 out Switched: ucast: 0 pkt, 0 bytes mcast: 0 pkt, 0 bytes

##########################################################################################

7606-A#sh run int gig 2/10

Current configuration : 102 bytes

!

interface GigabitEthernet2/10

ip address 192.168.0.235 255.255.255.0

speed 1000

duplex full

end

7606-A#sh int gig 2/10

GigabitEthernet2/10 is up, line protocol is up (connected)

Hardware is C6k 1000Mb 802.3, address is 0011.bbb1.a140 (bia 0011.bbb1.a140)

Internet address is 192.168.0.235/24

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 1000Mb/s, media type is 10/100/1000BaseT

input flow-control is off, output flow-control is off

Clock mode is auto

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:00, output 00:00:37, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/59/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 1000 bits/sec, 1 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

L2 Switched: ucast: 1656 pkt, 105984 bytes - mcast: 4679 pkt, 342779 bytes

L3 in Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes mcast

L3 out Switched: ucast: 0 pkt, 0 bytes mcast: 0 pkt, 0 bytes

Thanks

Girish

glen.grant · ‎05-09-2012

Thats because you are not using a crossover cable most likely . If you are using a straight thru cable the link will only come up if the port settings are set for auto/auto because the mdix feature will only work if the ports are auto. Generally leave gig ports as auto . I bet if you change the 3560 side to auto the link will come up . You can set the 3560 side as auto and restrict the speed to 100 if you want . USe the "speed auto 100" or speed auto 10" commands.

View solution in original post

glen.grant · ‎05-09-2012

Thats because you are not using a crossover cable most likely . If you are using a straight thru cable the link will only come up if the port settings are set for auto/auto because the mdix feature will only work if the ports are auto. Generally leave gig ports as auto . I bet if you change the 3560 side to auto the link will come up . You can set the 3560 side as auto and restrict the speed to 100 if you want . USe the "speed auto 100" or speed auto 10" commands.