Problem on Spanning Tree Protocol

Hi have the folloing problem on STP...

-------------SiteA: Cisco2950--------

| | 10mb| |10mb | | Site B: Cisco3550 ---------100mb-------------- Site C: Extreme Summit Switch

Site A-B primary circuit. (10mb LES10 circuit) Site A-C Secondary circuit. (10MB LES10 Circuit) Site B-C - 100MB connection

But with normal STP config it sees SiteA - SiteC as the primary (should be secondary) have tried setting priority on STP but no use... Any Ideas?

Thanks in advance.

Site A config : Cisco# version 12.0 no service pad service timestamps debug datetime msec service timestamps log datetime localtime show-timezone service password-encryption ! hostname Cisco ! enable secret 5 ########### ! clock summer-time uk recurring last Sat Mar 23:59 last Sat Oct 23:59 ! ip subnet-zero ! interface FastEthernet0/1 description COLT 10MB circuit to Site B duplex full speed 10 switchport mode trunk ! interface FastEthernet0/2 description LES10 to Site C duplex full speed 10 switchport mode trunk ! interface VLAN1 no ip directed-broadcast no ip route-cache shutdown ! interface VLAN9 ip address #.#.#.# 255.255.255.0 no ip directed-broadcast no ip route-cache ! ip default-gateway #.#.#.# snmp-server engineID local snmp-server community public RO snmp-server community private RW ! line con 0 password 7 #### login transport input none stopbits 1 line vty 0 4 password 7 #### login line vty 5 15 login ! ntp clock-period 17179805 ntp server 204.152.184.72 end

Reply to
ants
Loading thread data ...

I dont see any spanning-tree config. set site a as root, by bringing down its priority to a very low number. there r default commands for this in cisco( but site c may have a lower number since its not cisco)

increase the cost on the link between site a & c... spanning-tree cost xxx in int config mode.

Reply to
luqs

Cabling-Design.com Forums website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.