1. UDLD sends packets to a destination MAC address of 0100.0CCC.CCCC, which is a multicast address. It uses the following format:
UDLD SNAP format:
LLC value 0xAAAA03
Org Id 0x00000C
HDLC protocol type 0x0111
2. Both aggressive and normal mode UDLD uses UDLD messages; the difference is that the normal mode UDLD will consider the port to be in a "undetermined" state if the hellos time out. In aggressive mode, the port will be disabled ..
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