Connecting 2948G L3 to a 3500XL with fiber

[itbob]

Guy's

Before I install it, I am tring to connect a 2948G L3 (which is going to be our main switch) to a 3500XL via the Gbix ports, and not having much luck. I have sent the config files for you to look at. I would appreciate it if you could give me some pointers.

cheers

Bob.
----------------------------
2948G L3
clock timezone gmt 10
clock calendar-valid
sdm size ipx-bvi-network 32
sdm size ip-adjacency 2048
sdm size ipx-node 2048
sdm size ipx-network 6144
sdm size ip-mcast 3072
sdm size udp-flooding 256
sdm size l2-switching 1024
sdm autolearn
ip subnet-zero
!
interface Port-channel1
no ip address
no ip directed-broadcast
!
interface FastEthernet1
ip address 10.2.100.103 255.255.0.0
no ip directed-broadcast
!
interface FastEthernet2
no ip address
no ip directed-broadcast
.............
interface FastEthernet48
no ip address
no ip directed-broadcast
!
interface GigabitEthernet49
no ip address
no ip directed-broadcast
no negotiation auto
!
interface GigabitEthernet50
no ip address
no ip directed-broadcast
no negotiation auto
!
ip classless
!
!
line con 0
transport input none
line aux 0
line vty 0 4
password mine
login
!
-------------------------
3500XL
clock timezone gmt 10
!
ip subnet-zero
!
!
interface FastEthernet0/1
!
interface FastEthernet0/12
!
interface GigabitEthernet0/1
no negotiation auto
!
interface GigabitEthernet0/2
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface VLAN1
ip address 10.2.100.2 255.255.0.0
no ip directed-broadcast
no ip route-cache
!
no logging trap
logging source-interface VLAN1
!
line con 0
password 7 10481B10001916
login
transport input none
line vty 0 4
password 7 082C45400C
login
line vty 5 15
no login
transport input none
!
ntp clock-period 11259401
scheduler process-watchdog reload

 

[rburke]

Well from the looks of it you are turning off auto-negotiation (good thing in most cases), but I don't see any place that you specify the speed and duplex on the Gig ports? I can't recall the commands right now but generally they are "speed 1000" or "port speed 1000" and "duplex full" or "full-duplex", these are all issued on the interface config mode.

Let me know if this helps.

Burke

 

[itbob]

rburke

I tried the parameters you specified but the only one that works is the duplex full on the 3500xl, their are no speed parameters for the Gbix on either box.

Any other suggestions would be gladly appreciated.

cheers

itbob

 

[noackm]

I suggest you to turn on auto-negotiation on gigabit ports. They do auto-negotiation fine and while this process is running mor parameters the on fast-ethernet for example. We only turn of auto-negotiation for servers.

noackm

 

[BuckWeet]

Its a gigabit port, it can only run at gigabit speeds. and fiber has to be full duplex anyways.. So I'd leave auto negotiation on..

Do a "show interface gigabit #" # being the port of course, and make sure they recognize the GBICS properly..


BuckWeet

 

[jah3000]

Did you set up the trunk on the 2948 switch?

 

[itbob]

I have changed the Gbix ports to auto negotiation, still nothing

and

I did'nt now you had to set up a trunk on the 2948G L3, what would be the parameters you would use!!!

itbob

 

[jah3000]

If you are only going to have one vlan in your network, you don't need to trunk the connection. But I noticed that Gig0/2 on the 3500 is trunked. If one end of a connection is trunked, the other end must be trunked too for proper operation.
You also need to create Vlan 1 on the 2948. To create it, use the command interface vlan 1, and make sure you make it active with the no shutdown command.

 

[itbob]

jah3000,

I am connecting the 2948G L3's gig 1 port to the 3500XL gig 0/1 port so their is no trunking on these.

but, on the 2948G L3 I tried the interface vlan 1 command and all I got back was

interface vlan 1
^
% Invalid input detected at '^' marker.

2948G-L3(config)#interface vlan ?
<1-1000> Vlan interface number

2948G-L3(config)#interface vlan 1
^
% Invalid input detected at '^' marker.

 

[adj260]

are you getting a carrier on the fibre?

if not have you crossed the fibres?

 

[pmays]

I often have challenges configuring the 2948G-L3<groan>. Try this link it should help with your config:

http://www.cisco.com/warp/public/473/30.html#ex1

pmays
ccie#8498