SURPRISE : Beware of Backup Policies

2

0

3

1

2 1 0

2 0

1 3 0

1 0

3 4 2 0

3 0

4

4 0

4 2 0

4 3 0

Becomes BAD GADGET if link

(4, 0) goes down.

BGP is not robust :

it is not guaranteed

to recover from

network failures.

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