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AT-WA7500 and AT-WA7501 Installation and User’s Guide
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Frame Types That Are Never Forwarded
Certain frame types are never forwarded through IP tunnels. Frame types
that are never forwarded include IP frames used for coordinating routers
and MAC frames used for coordinating bridges. Other frame types that are
never forwarded include:
802.1d bridge frames
Proprietary VLAN switch frames
IP frames with a broadcast or multicast Ethernet address
IP frames with the following router protocol types and decimal values:
DGP (86) (Dissimilar Gateway Protocol)
EGP (8) (Exterior Gateway Protocol)
IDPR (35) (Inter-Domain Policy Routing Protocol)
IDRP (45) (Inter-Domain Routing Protocol)
IGP (9) (Interior Gateway Protocol)
IGRP (88)
MHRP (48) (Mobile Host Routing Protocol)
OSPFIGP (89) (Open Shortest Path First Interior Gateway
Protocol)
IP ICMP (Internet Control Message Protocol) types:
IPv6
Mobile IP
Router Advertisement
Router Selection
IP/UDP (User Datagram Protocol) frames with the following destination
protocol port numbers:
BGP (179) (Border Gateway Protocol)
RAP (38) (Route Access Protocol)
RIP (520) (Routing Information Protocol)
IP/TCP frames with the following destination or source protocol port
numbers:
BGP (179) (Border Gateway Protocol)
RAP (38) (Route Access Protocol)