Cisco 7604 Configuration Manual page 40

Software Features Supported in Hardware by the PFC and DFC
Note the following information about tunnels:
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For additional information (including configuration examples and troubleshooting information), see the
Tip
documents listed on this page:
http://www.cisco.com/en/US/products/hw/routers/ps368/tsd_products_support_series_home.html
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
1-6
Each hardware-assisted tunnel must have a unique source. Hardware-assisted tunnels cannot
share a source even if the destinations are different. Use secondary addresses on loopback
interfaces or create multiple loopback interfaces. (CSCdy72539)
Each tunnel interface uses one internal VLAN.
Each tunnel interface uses one additional router MAC address entry per router MAC address.
The PFC3A does not support any PFC QoS features on tunnel interfaces.
The PFC3B and PFC3BXL support PFC QoS features on tunnel interfaces.
The MSFC3 supports tunnels configured with egress features on the tunnel interface. Examples
of egress features are output Cisco IOS ACLs, NAT (for inside to outside translation), TCP
intercept, CBAC, and encryption.
Chapter 1 Product Overview
OL-4266-08