222 IBM 9077 SP Switch Router: Get Connected to the SP Switch
When port 0 is plugged in again, it resumes and takes over port 1, whi ch i n
turn falls back to the blocked state, as the following screen shot proves:
We expect this to happen also with the one-ported ATM OC-12c 622Mbit
media card, so if two of them are put into a bridging group, this could be a
fault tolerant scenario.
7.2 ATM OC-12c Backbone - One Port
This setup is basically the same as using just one port of an ATM OC-3c card,
as described in Section 7.1.1, “ATM OC-3c Backbone - Using One Port” on
page 210.
grf16:/root brstat
Bridge Group bg1
Spanning Tree: Enabled
Designated Root: 32768 00:c 0:80:84:8 c:eb
Bridge ID: 32768 00:c 0:80:96:3 8:68
Root Port: ga0180, Root Pat h Cost: 1 0
Topology Change Detected: N o
Root Max Age: 20, Hello T ime: 2, Forward D elay: 15
Bridge Max Age: 20, Hello T ime: 2, Forward D elay: 15 , Hold Time: 1
Pat h Desig Desig Desig
Interface Port ID Con State Cos t Cost Bridge Port
--------- ------- --- ----- ----- --- -- ----- -------- ------ --------- -------
ga010 128 1 No Disab led 10
*ga0180 128 2 Yes Forwa rding 10 0 32768 00 :c0:80 :84:8c:eb 128 2
Dump snapshot finished at Mon Jun 15 20 :01:51 19 98
grf16:/root brstat
Bridge Group bg1
Spanning Tree: Enabled
Designated Root: 32768 00:c 0:80:84:8 c:eb
Bridge ID: 32768 00:c 0:80:96:3 8:68
Root Port: ga010, Root Path Cost: 10
Topology Change Detected: N o
Root Max Age: 20, Hello T ime: 2, Forward D elay: 15
Bridge Max Age: 20, Hello T ime: 2, Forward D elay: 15 , Hold Time: 1
Pat h Desig Desig Desig
Interface Port ID Con State Cos t Cost Bridge Port
--------- ------- --- ----- ----- --- -- ----- -------- ------ --------- -------
*ga010 128 1 Yes Forwa rding 10 0 32768 00 :c0:80 :84:8c:eb 128 1
ga0180 128 2 Yes Block ing 10 0 32768 00 :c0:80 :84:8c:eb 128 2
Dump snapshot finished at Mon Jun 15 20 :02:03 19 98