Nexus 4000 won't connect to 6509

[hallvard.solem]

Hi,

we have a new IBM Bladechassie with two Cisco nexus 4001i switches.
I have configured one external port on each nexus and connected them to a cisco 6509 with 1G cisco SFP-modules and MM fibre.
Both the nexus and 6509 ports are configured as trunk ports, and set speed to 1000.
I see light in the SFP-modules on both devices, and through the fibre.

When I connect the devices, the link doesn't come up. No light on the ports, the nexus says "link not connected", and the 6509 says "notconnect".

I have tried reconfiguring the ports in many ways, even as accessports, nothing seems to work.

If I move the SFP and fibre from the 6509 over to a trunk port on a cisco c2960-24TC-L, the link comes up and everything is working fine.

Can anyone explain to me why this work on a 2960 and not my 6509 coreswitch?

One of the configs I've tried on the 6509:
interface GigabitEthernet2/20
description *IBM Bladechassie 2 NW1*
switchport
switchport trunk encapsulation dot1q
switchport trunk native vlan 34
switchport trunk allowed vlan 34
switchport mode trunk
end

Nexus config (works with 2960):
interface Ethernet1/15
  switchport mode trunk
  speed 1000

6509 ios: 12.2(33)SXI3

6509 SFP module: CEF720 24 port 1000mb SFP / WS-X6724-SFP

Thanks in advance

[Reza Sharifi]

On the 6509, is the SFP MM also? 

If yes, try a different SFP and port

Also, make sure the patch cord's TX, and RX are not crossed.  If they are try switch the strands around and test again.

HTH

[hallvard.solem]

Yes, both SFP is MM, i've tried several of these.

I have also tried to cross the tx/rx cables without luck.

[hallvard.solem]

Yes, they are both MM. I've tried several different SFP-modules.

I have also tried to cross the fibre cables, with no luck

[Reza Sharifi]

Does the module come up at all.  What is the output of "sh mod"?

are you using sup-720?

[hallvard.solem]

Yes, the module comes up, we are using sup-720.

I have a lot of other switches connected to the module, and I've also tested this port against another switch and it works fine.

sh mod:

XX#sh mod
Mod Ports Card Type                              Model              Serial No.
--- ----- -------------------------------------- ------------------ -----------
  1   48  CEF720 48 port 10/100/1000mb Ethernet  WS-X6748-GE-TX     XX
  2   24  CEF720 24 port 1000mb SFP              WS-X6724-SFP       XX
  5    2  Supervisor Engine 720 (Active)         WS-SUP720-BASE     XX
  6   48  CEF720 48 port 10/100/1000mb Ethernet  WS-X6748-GE-TX     XX
  7   48  SFM-capable 48 port 10/100/1000mb RJ45 WS-X6548-GE-TX     XX

Mod MAC addresses                       Hw    Fw           Sw           Status
--- ---------------------------------- ------ ------------ ------------ -------
  1  0015.62e1.2e94 to 0015.62e1.2ec3   2.3   12.2(14r)S5  12.2(33)SXI3 Ok
  2  0015.6301.7be8 to 0015.6301.7bff   2.3   12.2(14r)S5  12.2(33)SXI3 Ok
  5  0013.c42e.e8d4 to 0013.c42e.e8d7   3.3   8.1(3)       12.2(33)SXI3 Ok
  6  0024.c463.3a38 to 0024.c463.3a67   3.2   12.2(18r)S1  12.2(33)SXI3 Ok
  7  0005.7442.8d0c to 0005.7442.8d3b  10.2   7.2(1)       12.2(33)SXI3 Ok

Mod  Sub-Module                  Model              Serial       Hw     Status
---- --------------------------- ------------------ ----------- ------- -------
  1  Centralized Forwarding Card WS-F6700-CFC       XX  2.0    Ok
  2  Centralized Forwarding Card WS-F6700-CFC       XX  2.0    Ok
  5  Policy Feature Card 3       WS-F6K-PFC3A       XX  2.5    Ok
  5  MSFC3 Daughterboard         WS-SUP720          XX  2.5    Ok
  6  Centralized Forwarding Card WS-F6700-CFC       XX  4.1    Ok

Mod  Online Diag Status
---- -------------------
  1  Pass
  2  Pass
  5  Pass
  6  Pass
  7  Pass

[hallvard.solem]

Solution: the port on 6509 had to have the following configuration:

bandwidth 1000

speed nonegotiate