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Documentation states that you can (I'm assuming) globally disable aggressive mode with:

isakmp am-disable

Not exactly clear on the behavior when two peers are negotiating phase 1 in Cisco land, but in other firewalls, you usually can specific whether to use Main or Aggressive on each tunnel configuration; not exactly sure how to do this with an ASA 5505.

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up vote 1 down vote accepted

The phase 1 mode can be customized in the crypto map for the individual peer.

crypto map tunnel-name 1 set peer
crypto map tunnel-name 1 set match address tunnel-acl
crypto map tunnel-name 1 set phase1-mode [aggressive|main]
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ah, ok great... – gravyface May 10 '11 at 21:44

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