Catalyst 3750-E and 3560-E Switch Cisco IOS ... - DNIP . NET

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ip dhcp snooping information optionChapter 2Catalyst 3750-E and 3560-E Switch Cisco IOS CommandsRelated Commands Command Descriptionshow ip dhcp snoopingDisplays the DHCP snooping configuration.show ip dhcp snooping binding Displays the DHCP snooping binding information.2-238Catalyst 3750-E and 3560-E Switch Command ReferenceOL-9776-08
Chapter 2Catalyst 3750-E and 3560-E Switch Cisco IOS Commandsip dhcp snooping information option allow-untrustedip dhcp snooping information option allow-untrustedUse the ip dhcp snooping information option allow-untrusted global configuration command on anaggregation switch to configure it to accept DHCP packets with option-82 information that are receivedon untrusted ports that might be connected to an edge switch. Use the no form of this command to returnto the default setting.ip dhcp snooping information option allow-untrustedno ip dhcp snooping information option allow-untrustedSyntax DescriptionThis command has no arguments or keywords.DefaultsThe switch drops DHCP packets with option-82 information that are received on untrusted ports thatmight be connected to an edge switch.Command ModesGlobal configurationCommand HistoryRelease12.2(35)SE2ModificationThis command was introduced.Usage GuidelinesYou might want an edge switch to which a host is connected to insert DHCP option-82 information atthe edge of your network. You might also want to enable DHCP security features, such as DHCPsnooping, IP source guard, or dynamic Address Resolution Protocol (ARP) inspection, on anaggregation switch. However, if DHCP snooping is enabled on the aggregation switch, the switch dropspackets with option-82 information that are received on an untrusted port and does not learn DHCPsnooping bindings for connected devices on a trusted interface.If the edge switch to which a host is connected inserts option-82 information and you want to use DHCPsnooping on an aggregation switch, enter the ip dhcp snooping information option allow-untrustedcommand on the aggregation switch. The aggregation switch can learn the bindings for a host eventhough the aggregation switch receives DHCP snooping packets on an untrusted port. You can alsoenable DHCP security features on the aggregation switch. The port on the edge switch to which theaggregation switch is connected must be configured as a trusted port.NoteDo not enter the ip dhcp snooping information option allow-untrusted command on an aggregationswitch to which an untrusted device is connected. If you enter this command, an untrusted device mightspoof the option-82 information.OL-9776-08Catalyst 3750-E and 3560-E Switch Command Reference2-239
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dot1x critical (global configuratio
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dot1x critical (interface configura
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dot1x fallbackChapter 2Catalyst 375
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dot1x guest-vlanChapter 2Catalyst 3
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dot1x initializeChapter 2Catalyst 3
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dot1x mac-auth-bypassChapter 2Catal
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dot1x max-reauth-reqChapter 2Cataly
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dot1x paeChapter 2Catalyst 3750-E a
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dot1x port-controlChapter 2Catalyst
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dot1x reauthenticationChapter 2Cata
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dot1x test eapol-capableChapter 2Ca
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dot1x timeoutChapter 2Catalyst 3750
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dot1x timeoutChapter 2Catalyst 3750
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duplexChapter 2Catalyst 3750-E and
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epm access-controlChapter 2Catalyst
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errdisable detect causeChapter 2Cat
Page 188 and 189: errdisable detect cause small-frame
Page 190 and 191: errdisable recoveryChapter 2Catalys
Page 192 and 193: errdisable recoveryChapter 2Catalys
Page 194 and 195: exception crashinfoChapter 2Catalys
Page 196 and 197: fallback profileChapter 2Catalyst 3
Page 198 and 199: flowcontrolChapter 2Catalyst 3750-E
Page 200 and 201: hw-moduleChapter 2Catalyst 3750-E a
Page 202 and 203: interface port-channelChapter 2Cata
Page 204 and 205: interface rangeChapter 2Catalyst 37
Page 206 and 207: interface vlanChapter 2Catalyst 375
Page 208 and 209: ip access-groupChapter 2Catalyst 37
Page 210 and 211: ip addressChapter 2Catalyst 3750-E
Page 212 and 213: ip admissionChapter 2Catalyst 3750-
Page 214 and 215: ip admission name proxy httpChapter
Page 216 and 217: ip arp inspection filter vlanChapte
Page 218 and 219: ip arp inspection limitChapter 2Cat
Page 220 and 221: ip arp inspection log-bufferChapter
Page 222 and 223: ip arp inspection trustChapter 2Cat
Page 224 and 225: ip arp inspection validateChapter 2
Page 226 and 227: ip arp inspection vlan loggingChapt
Page 228 and 229: ip device trackingChapter 2Catalyst
Page 230 and 231: ip device tracking probeChapter 2Ca
Page 232 and 233: ip dhcp snoopingChapter 2Catalyst 3
Page 234 and 235: ip dhcp snooping bindingChapter 2Ca
Page 236 and 237: ip dhcp snooping databaseChapter 2C
Page 240 and 241: ip dhcp snooping information option
Page 242 and 243: ip dhcp snooping limit rateChapter
Page 244 and 245: ip dhcp snooping verifyChapter 2Cat
Page 246 and 247: ip dhcp snooping vlan information o
Page 248 and 249: ip igmp filterChapter 2Catalyst 375
Page 250 and 251: ip igmp max-groupsChapter 2Catalyst
Page 252 and 253: ip igmp profileChapter 2Catalyst 37
Page 254 and 255: ip igmp snoopingChapter 2Catalyst 3
Page 256 and 257: ip igmp snooping last-member-query-
Page 258 and 259: ip igmp snooping querierChapter 2Ca
Page 260 and 261: ip igmp snooping report-suppression
Page 262 and 263: ip igmp snooping tcnChapter 2Cataly
Page 264 and 265: ip igmp snooping tcn floodChapter 2
Page 266 and 267: ip igmp snooping vlan mrouterChapte
Page 268 and 269: ip igmp snooping vlan staticChapter
Page 270 and 271: ip snap forwardingChapter 2Catalyst
Page 272 and 273: ip source bindingChapter 2Catalyst
Page 274 and 275: ip sshChapter 2Catalyst 3750-E and
Page 276 and 277: ip sticky-arp (global configuration
Page 278 and 279: ip sticky-arp (interface configurat
Page 280 and 281: ip verify sourceChapter 2Catalyst 3
Page 282 and 283: ipv6 access-listChapter 2Catalyst 3
Page 284 and 285: ipv6 address dhcpChapter 2Catalyst
Page 286 and 287: ipv6 dhcp ping packetsChapter 2Cata
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ipv6 dhcp poolChapter 2Catalyst 375
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ipv6 dhcp poolChapter 2Catalyst 375
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ipv6 dhcp serverChapter 2Catalyst 3
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ipv6 mld snoopingChapter 2Catalyst
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ipv6 mld snooping last-listener-que
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ipv6 mld snooping last-listener-que
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ipv6 mld snooping robustness-variab
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ipv6 mld snooping tcnChapter 2Catal
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ipv6 mld snooping vlanChapter 2Cata
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ipv6 traffic-filterChapter 2Catalys
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l2protocol-tunnelChapter 2Catalyst
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l2protocol-tunnelChapter 2Catalyst
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lacp port-priorityChapter 2Catalyst
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lacp system-priorityChapter 2Cataly
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license bootChapter 2Catalyst 3750-
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link state groupChapter 2Catalyst 3
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link state trackChapter 2Catalyst 3
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location (global configuration)Chap
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location (interface configuration)C
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logging event power-inline-statusCh
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logging fileChapter 2Catalyst 3750-
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mab request format attribute 32Chap
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mac access-groupChapter 2Catalyst 3
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mac access-list extendedChapter 2Ca
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mac address-table learning vlanChap
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mac address-table move updateChapte
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mac address-table notificationChapt
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mac address-table staticChapter 2Ca
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mac address-table static dropChapte
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match (access-map configuration)Cha
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match (class-map configuration)Chap
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mdix autoChapter 2Catalyst 3750-E a
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mls qosChapter 2Catalyst 3750-E and
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mls qos aggregate-policerChapter 2C
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mls qos cosChapter 2Catalyst 3750-E
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mls qos dscp-mutationChapter 2Catal
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mls qos mapChapter 2Catalyst 3750-E
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mls qos mapChapter 2Catalyst 3750-E
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mls qos queue-set output buffersCha
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mls qos queue-set output thresholdC
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mls qos rewrite ip dscpChapter 2Cat
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mls qos srr-queue input bandwidthCh
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mls qos srr-queue input buffersChap
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mls qos srr-queue input cos-mapChap
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mls qos srr-queue input dscp-mapCha
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mls qos srr-queue input priority-qu
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mls qos srr-queue input thresholdCh
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mls qos srr-queue output cos-mapCha
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mls qos srr-queue output dscp-mapCh
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mls qos trustChapter 2Catalyst 3750
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mls qos vlan-basedChapter 2Catalyst
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monitor sessionChapter 2Catalyst 37
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mvr (global configuration)Chapter 2
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mvr (interface configuration)Chapte
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mvr (interface configuration)Chapte
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network-policy profile (global conf
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network-policy profile (network-pol
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nmsp attachment suppressChapter 2Ca
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no dot1x syslog verboseChapter 2Cat
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nsfChapter 2Catalyst 3750-E and 356
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pagp learn-methodChapter 2Catalyst
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pagp port-priorityChapter 2Catalyst
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permit (ARP access-list configurati
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permit (IPv6 access-list configurat
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permit (MAC access-list configurati
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permit (MAC access-list configurati
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policeChapter 2Catalyst 3750-E and
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police aggregateChapter 2Catalyst 3
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policy-mapChapter 2Catalyst 3750-E
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port-channel load-balanceChapter 2C
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power inlineChapter 2Catalyst 3750-
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power inlineChapter 2Catalyst 3750-
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power inline consumptionChapter 2Ca
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power inline policeChapter 2Catalys
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power rpsChapter 2Catalyst 3750-E a
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power supplyChapter 2Catalyst 3750-
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priority-queueChapter 2Catalyst 375
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private-vlanChapter 2Catalyst 3750-
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private-vlanChapter 2Catalyst 3750-
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private-vlan mappingChapter 2Cataly
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adius-server dead-criteriaChapter 2
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adius-server hostChapter 2Catalyst
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commandChapter 2Catalyst 3750-E and
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eloadChapter 2Catalyst 3750-E and 3
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emote commandChapter 2Catalyst 3750
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emote-spanChapter 2Catalyst 3750-E
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enew ip dhcp snooping databaseChapt
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eserved-onlyChapter 2Catalyst 3750-
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Catalyst 3750-E and 3560-E Switch Cisco IOS ... - DNIP . NET

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