andard, 526 GAD's maxims network design, 391-393 maxim 1, 705-708 ordering service, 390 oversubscription and, 393 maxim 2, 708-709 speed mismatch scenario, 602-606 maxim 3, 709-713 subinterfaces and, 391, 401 Gateway Load Balancing Protocol (see GLBP) troubleshooting, 403-407 Gateway to Gateway Protocol (GGP), 105 frame-relay interface-dlci command, 402 gateways defined, 105 frame-relay lmi-type command, 394 frame-relay map command, 399, 402 as forwarders, 190 frames GEC (Gigabit EtherChannel) (see EtherChannel) defined, 10, 360 discard-eligible, 390 Generic Routing Encapsulation (see GRE) switches and, 11 GGP (Gateway to Gateway Protocol), 105 tag, 38 Gigabit EtherChannel (see EtherChannel) tagging, 39 Gigabit Ethernet, 19, 20 VLANs and, 25 GLBP (Gateway Load Balancing Protocol) framing functionality, 189-194 C-bits, 377 object tracking, 194-196 clear-channel DS3, 378 global command, 502, 503, 505 D4, 360 global macros, 321 defined, 360 global unicast addresses, 676 DS3 and, 375 GRE (Generic Routing Encapsulation) access lists and, 178 Extended Super Frame, 360 firewalls and, 179 M13, 376 superframe, 360 functionality, 167 GRE tunnels T1 and, 359 framing command, 379 creating, 168-173 framing errors, 360 functionality, 167 frustration, avoiding (see avoiding frustration) routing protocols and, 173-178 FTP packets, 575 grep command (NX-OS), 278 group method, 454, 456 Index group radius method, 454, 456 group tacacs+ method, 454, 456 grouping access lists, 421-423 IANA (Internet Assigned Numbers Authority), 120, 649 ICMP (Internet Control Message Protocol), H.225 protocol, 525 IDSMs (Intrusion Detection System Modules), H.245 protocol, 525 15, 248 H.323 protocol, 525 IDSs (Intrusion Detection Systems), 332 hairpinning, defined, 527 IEEE 802.11a standard, 512 half duplex IEEE 802.11b standard, 512 functionality, 19 IEEE 802.11g standard, 512 half-duplex IEEE 802.11i standard, 515 autonegotiation failure and, 21 IEEE 802.11n standard, 512 duplex mismatch problem, 101 IEEE 802.1Q standard HDB3 line coding, 379 trunki