interface GigabitEthernet0/26 switchport trunk encapsulation dot1q switchport trunk native vlan 5 switchport trunk allowed vlan 5,10,20,99 switchport mode trunk

switchport nonegotiate

!

interface GigabitEthernet0/27 switchport trunk encapsulation dot1q switchport trunk native vlan 5 switchport trunk allowed vlan 5,10,20,99 switchport mode trunk

!

interface GigabitEthernet0/28

!

interface Vlan1

no ip address

interface Vlan10

ip address 10.10.0.245 255.255.255.0

!ip address 10.10.0.246 255.255.255.0 on Core2

interface Vlan20

ip address 10.20.0.245 255.255.255.0

!ip address 10.20.0.246 255.255.255.0 on Core2

interface Vlan99

ip address 10.99.0.245 255.255.255.0

!ip address 10.99.0.245 255.255.255.0 on Core2

ip default-gateway 9.42.171.3 ip classless

ip route 0.0.0.0 0.0.0.0 9.42.171.3 ip http server

ip http secure-server

control-plane

line con 0 line vty 0 4 password cisco no login line vty 5 15 no login

end

7.7.4Multi-Spanning Tree IEEE 802.1s

During the writing of this book, it was not possible to create and test a stable configuration with the GbESM and the Cisco 3560 devices both configured to run MSTP. After our testing was completed, we learned that this is remedied in IOS version 12.2(25)SEC on the Cisco 3750. We assume that similarly numbered versions on other platforms will also include this fix.

Configurations for use of MST

The MST (802.1s) protocol, like the prestandard multiple spanning tree group capability of the GbESM, allows for multiple instances of spanning tree to run at the same time. Each

Chapter 7. Nortel Networks L2/3 GbESM configuration and network integration 101

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IBM L2/3 manual Multi-Spanning Tree Ieee 802.1s, Configurations for use of MST