1. Bearer Capability (ISDN中) (Q184)
B channel 的承载容量 64K.
但对于 Bearer Capability i = 0x8890 indicates a 64k Digital request，不明白是怎么算出来的。
2. ISL (Interior Switching Link) 干道封装协议之一
3. 802.xx IE
EE 802.1Q 以太网 干道封装协议之一 IE
EE 802.10 FDDI 干道封装协议之一
4. back-door bridge (Q47) IPX
Novell IPX: ClIE
nt Cannot Connect to Server on Remote LAN
Back-door bridge between segments exists.
1). Use the show ipx traffic exec command on intermediate routers. Determine whether the bad hop count fIE
ld is incrementing.
2). If the bad hop count counter is incrementing, use a network analyzer to look for packet loops on suspect segments. Look for RIP3 and SAP updates as well. If a back-door bridge exists, you are likely to see hop counts that increment to 16, at which time the route disappears and reappears unpredictably.
3). Look for packets from known remote network numbers that appear on the local network. Look for packets whose source address is the MAC4 address of the remote node instead of the MAC address of the router.
4). Examine packets on each segment. A back door is present on the segment if packets appear whose source address is the MAC address of a remote node instead of that of the router.
5). Remove the back-door bridge to close the loop.
bad hop count
Number of packets diSC
arded because their hop count exceeded 16.
Number of packets containing a checksum error. This number should always be 0, because IPX rarely uses a checksum.
5. format errors (228) IPX
Number of bad packets diSC
arded (for example, packets with a corrupted header). Includes IPX packets received in an encapsulation that this interface is not configured for.