bluebirds1984
asked on
Link aggregation and Spanning Tree on ALCATEL 7800 switches
Hi, heres the set up....
im bench testing 2 Alcatel 7800 Switches, the current config copied from 2 existing Switches.
the current switches use Spanning Tree using 2 fibre ports, one port blocking, the other forwarding.
on the bench i've added to the current configuration an aggregated link using gigabit Ethernet.
now I have 2 active conections conecting the switches.
- 1 Gigabit Fibre link forwarding (with another blocking Span Tree)
- 1 Aggregated link gigabit ethernet.
now i'm sure this is a Loop in the network between the 2 switches?? am I right?
if so why doesnt the spanning tree doesnt block the forwarding conection??
im bench testing 2 Alcatel 7800 Switches, the current config copied from 2 existing Switches.
the current switches use Spanning Tree using 2 fibre ports, one port blocking, the other forwarding.
on the bench i've added to the current configuration an aggregated link using gigabit Ethernet.
now I have 2 active conections conecting the switches.
- 1 Gigabit Fibre link forwarding (with another blocking Span Tree)
- 1 Aggregated link gigabit ethernet.
now i'm sure this is a Loop in the network between the 2 switches?? am I right?
if so why doesnt the spanning tree doesnt block the forwarding conection??
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
ASKER
SWITCH 1 SWITCH 2
GIGABIT FIBRE --------------------------
SPANNING TREE CONFIG
GIGABIT FIBRE---------------------
GIGABIT ETHERNET------------------
AGGREGATED LINK CONFIG - UP
GIGABIT ETHERNET------------------
hopefully the above explains it a bit more clearly
there are 2 active conections between the switches, causing a loop.
Forgetting about the pro's or cons between Fibre or Ethernet, id like to know peoples thoughts on why the Spanning tree fibre isn't blocking?
pseudocyber - what do you mean when you say Spanning Tree Group? i wish we used Cisco instead of Alcatel, nobody uses Alcatel!
GIGABIT FIBRE --------------------------
SPANNING TREE CONFIG
GIGABIT FIBRE---------------------
GIGABIT ETHERNET------------------
AGGREGATED LINK CONFIG - UP
GIGABIT ETHERNET------------------
hopefully the above explains it a bit more clearly
there are 2 active conections between the switches, causing a loop.
Forgetting about the pro's or cons between Fibre or Ethernet, id like to know peoples thoughts on why the Spanning tree fibre isn't blocking?
pseudocyber - what do you mean when you say Spanning Tree Group? i wish we used Cisco instead of Alcatel, nobody uses Alcatel!
You can have different spanning tree groups. If the ports in the fiber are in group 1, and the ports in copper are in group 2, they could both be forwarding without seeing a loop.
On the other hand, perhaps your spanning tree isn't working right?
On the other hand, perhaps your spanning tree isn't working right?
ASKER
yeah i see what you mean.
i have one spanning tree group and one link aggregation group. from what I've read the link agg group needs to be included in the Spanning Tree group, but not as the individual ports but as the Virtual port thats assigned to it.
i'll test it out when I get the opportunity and post the results.
i have one spanning tree group and one link aggregation group. from what I've read the link agg group needs to be included in the Spanning Tree group, but not as the individual ports but as the Virtual port thats assigned to it.
i'll test it out when I get the opportunity and post the results.
ASKER
I added the virtual link agg port to the spanning tree group and it worked perfectly.
thanks
thanks
Thanks. :)
physical links acting as one virtual link? If so then the aggregated link(s) are acting as one virtual link and spanning tree sees that as just one link. Please clarify.
harbor235