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ASA5520 VPN support over DSL

Any limits on the number of IPSec sessions an ASA5520 can support over a DSL connection?

Currently, as we increase the number of IPSec VPN tunnels, our LAN switches connected to the DSL/ASA start seeing CRC/input errors.   Tried different LAN ports for both DSL/ASA connections - same reults (CRCs and errors).   Swapped ASA for PC running 1 IPSEC w/HD video and no issues.

VPN connection bandwidth demand 50% of DSL capacity, so not exceeding DSL bandwidth.    Errors get so bad that all VPN sessions drop - sometimes VPN sessions re-establish while other instances a DSL modem reboot is required.

Any ideas on cause of LAN switch connections seeing errors with 4+ VPN sessions established on ASA across a DSL Internet circuit?

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ASA5520 VPN support over DSL

CRC/input  errors  are generaly indications of physical issues,   start by looking at cabling , correct speed duplex settings at both ends .

here are some good resoureces  for optimizing asa prtformance ,   see Speed and Duplex Settings section  

http://www.cisco.com/en/US/products/ps6120/products_tech_note09186a0080b8e100.shtml

Regards

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