A B1 2 B3 B B1 0 B1 C B1 1 B7 D All of the above What if root bridge fails u

A b1 2 b3 b b1 0 b1 c b1 1 b7 d all of the above what

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A. (B1, 2, B3) B. (B1, 0, B1) C. (B1, 1, B7) D. All of the above
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What if root bridge fails? u Age configuration info » If not refreshed for MaxAge seconds then delete root and recalculate spanning tree » If config message is received with a more recent age, then recalculate spanning tree u Applies to all bridges (not just root) Temporary loops u When topology changes, takes a bit for new configuration messages to spread through the system u Don’t start forwarding packets immediately -> wait some time for convergence 8 Important Details CSE 123 – Lecture 8: Networks to Internetworks
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Switched Ethernet Hosts directly connected to a bridge u learning + spanning tree protocol Switch supports parallel forwarding u A-to-B and A’-to-B’ simultaneously u Generally full duplex as well Switch backplane capacity varies u Ideally, non-blocking u I.e., can run at full line rate on all ports No longer any shared bus u Each link is its own collision domain CSE 123 – Lecture 8: Networks to Internetworks 9
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Create spanning tree across LANs u Learn which ports to use to reach which addresses Benefits u Higher link bandwidth (point-to-point links) u Higher aggregate throughput (parallel communication) u Improved fault tolerance (redundant paths) Limitations u Requires homogeneous link layer (e.g. all Ethernet) u Harder to control forwarding topology What if we want to connect different link layers?
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  • Fall '08
  • Varghese,G

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