Ensure that PVST is selected as Spanning Tree mode, enter:

conf t spanning-tree mode pvst

Core1 should become the Root Bridge for VLAN 5 and 10 while being backup Root for VLAN

20 and 99:

spanning-tree vlan 1-10 root primary spanning-tree vlan 11-4094 root secondary end

Vice versa for Core2, so that it will be elected as Root Bridge for VLAN 20 and 99, backing up the Root for VLAN 5 and 10:

spanning-tree vlan 1-10 root secondary spanning-tree vlan 11-4094 root primary end

Reenable the ports

After verifying the correct cabling between all the devices, the ports can be re-enabled.

￿Enabling the ports on GbESM_1 and GbESM_2

/oper/port EXT1/ena /oper/port EXT2/ena /oper/port EXT5/ena /oper/port EXT6/ena

￿Enabling the ports on Core1 and Core2

conf t

int range g0/1-2, g0/11-12 no shut

Verify the Spanning Tree status

As shown in Example 7-11,the port status and the VLAN assignment could be verified by entering info/link and info/port on the GbESM.

Example 7-11 Verifying port status and VLAN assignment

>>GbESM_1 - Configuration# /i/link

------------------------------------------------------------------

Alias

Port Speed

Duplex

Flow Ctrl

Link

--------- ----- -------- --TX-----RX-- ------

INT1

1

1000

full

yes

yes

up

INT2

2

1000

full

yes

yes

up

INT3

3

1000

full

yes

yes

up

INT4

4

1000

full

yes

yes

up

INT5

5

1000

full

yes

yes

up

INT6

6

1000

full

yes

yes

up

INT7

7

1000

full

yes

yes

up

INT8

8

1000

full

yes

yes

down

INT9

9

1000

full

yes

yes

down

INT10

10

1000

full

yes

yes

down

INT11

11

1000

full

yes

yes

down

INT12

12

1000

full

yes

yes

down

INT13

13

1000

full

yes

yes

down

INT14

14

1000

full

yes

yes

down

MGT1

15

100

full

yes

yes

up

MGT2

16

100

full

yes

yes

disabled

EXT1

17

1000

full

no

no

up

EXT2

18

1000

full

no

no

up

86Nortel Networks L2/3 Ethernet Switch Module for IBM Eserver BladeCenter

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IBM L2/3 manual Reenable the ports, Verify the Spanning Tree status, Example 7-11 Verifying port status and Vlan assignment