ccna free practice exam

ccna free practice exam.The above output indicates that the EtherChannel negotiation was successful and the protocol is PAgP.Note that both ends of the link should be checked to confirm that both ends form a port channel, and the SU indicates that the EtherChannel is working properly. Sl#show etherchannel port-channel View the ports included in the specified EtherChannel Channel-group listing:Group:]/group numberPort-channels in the group:.258.Cisco Networking Lab CCNA Lab Guide (Release 2)Port-channel: Pol Port-channel nameAgeofthePort-channel =0d:00h:llm:05s// The length of time the port-channel was formed Logicalslot/port =2/1 Numberofports =2 The number of physical ports added to the port-channel GC =0x00010001 HotStandByport =nullHotStandByport =null means that all physical ports are in use Portstate =Port-channelAg-Inuse Portstate Protocol =PAgP Negotiation protocol used Ports in the Port-channel: Ports added to the Port-channelIndex Load Port ECstate NoofbitsThe port in the Port-channel: Port in the Port-channel: Port added to the Port-channel Index Load Port ECstate Noofbits The above column and 4 rows give the port information of the port channel, including index, load, physical port, EtherChannel status, etc. Time since last portbundled: 0d:00h:03m:41s TimesincelastportUn-bundled:0d:00h:04m: 04s FaO/14 time since the last port was aggregated Sl#show etherchannel protocol FaO/14 time since the last port was not aggregated Channel-group listing: Check the protocols used for EtherChannel negotiation Group: 1 Protocol:PAgP //EtherChannel negotiation protocol (5) Configure LACP to negotiate EtherChannel Configure the switch SI. Sl(config)#default interface range fastEthernetO/13 -14 Sl(config)#lacp system-priority 100 S1 (config)#interface Configure the LACP system priority, the default is 32768 fastEthernetO/13 S1 (config-if)#channel-protocollacp S1 (config-if)#channel-group 1 mode active Sl(config-if)#lacp Configure promo LACP protocol negotiation EtherChannel port-priority 1313Configure LACP negotiation modeConfigure LACP port priority, default is 32768 S1 (config-if)#switchporttrunk encapsulation dotlq S1 (config-if)#switchportmode trunk Sl(config-if)#exit SI(config)#interface fastEthernetO/14 S l(config-if)#channel-protocollacp S l(config-if)#channel-group 1 mode active Configure LACP protocol negotiation EtherChannel Sl(config-if)#lacp port-priority 1414 S1 (config-if)^switchport trunk encapsulation dotlq S1 (config-if)#switchportmode trunk Configure switch S2. s2(config)#default interface range fastEthernetO/13 -14 s2(config)#lacp system-priority 200 s2(config)#interface range fastEthernetO/13 -14 S2(config-if-range)#channel-protocollacp S2(config-if-range)#channel-group 1 mode passive Configuring LACP Negotiation Mode S2(config-if^ range)#switchporttrunk encapsulation dotlq S2(config-if-range)#switchport mode trunk Chapter 15 EtherChannel and FHRP .259. .260.Cisco Networking Lab CCNA Lab Guide (Release 2) Multiple [Technical Highlights]. 1 After the switch activates the LACP protocol for a port, the port will inform the other end of its system priority, system MAC address, port priority and port number by sending LACPDUs. After receiving this information, the other end compares this information with its own attributes and selects a port that can be aggregated, so that both parties can agree on the port joining or leaving a certain dynamic aggregation group. 2 Since there is a limit to the maximum number of ports that the switch can support per EtherChannel group, if the current number of member ports exceeds the limit of the maximum number of ports that can be aggregated, the local system and the peer system negotiate to determine the status of the ports based on the switch LACP system ID, and the side with the smaller LACP system ID is the active side. At the active end, the LACP port priority is compared first, and the port with the smaller port priority is selected. If the LACP port priority is the same, the port number is compared, and the one with the smaller port number is selected and added to the EtherChannel group. (6) Verify the LACP negotiation EtherChannel Sl#show etherchannel summary (some output is omitted here) Group Port-channel Protocol Ports ------+--------------+------------+- 1 Pol(SU) LACP FaO/13(P) FaO/14(P) The above output indicates that the EtherChannel negotiation is successful and the protocol is LACP. Note that both ends of the link should be checked to make sure that both ends form a port channel. Sl#show etherchannel protocol Channel-group listing: Group: 1 Protocol: LACP //EtherChannel negotiation protocol Sl#show lacp sys-id //View LACP system ID 100, d0c7.89ab.1180 //The system ID consists of the system priority + switch base MAC address S2#show lacp neighbor LACP port Admin Oper Port Port Port Flags Priority Dev ID Age key Key Number State FaO/13 SA 1313 d0c7.89ab.1180 15s 0x0 0x1 0x110 0x3D FaO/14 SA 1414 d0c7.89ab.1180 5s 0x0 0x1 0x111 0x3D View LACP neighbor information P -Device is in Passive mode Chapter 15 EtherChannel and FHRP .261. Flags: S -Device is requesting Slow LACPDUs F - Device is requesting Fast LACPDUs A -Device is in Active mode Device is in Active mode Channel group 1 neighbors Partner's information: The above output shows the information of LACP neighbor S1 of switch S2, where S in the Flags field indicates that the device is sending LACP packets with Slow speed (Slow) and A indicates that the mode of LACP is The frequency of ActiveoLACP sending messages can be configured to send LACP packets every 1 second or 30 seconds, both of which are specified by the IEEE802.3ad standard. When configured as Fast, the peer sends LACP messages with a period of 1 second: when configured as Slow, the peer sends LACP messages with a period of 30 seconds. The 3560 switch in this test platform does not support the Fast method ( 65 series switches support it). the command configured under the port is lacp rate fasto The timeout time of LACP protocol messages is three times the period of LACP messages sent. The timeout time configured at both ends can be inconsistent. However, for ease of maintenance, it is recommended that users configure a consistent timeout for LCAP protocol messages. The above output also shows the LACP port priority, device ID, aging time, management key, operation key, port number, and port status of the neighboring ports connected through this switch port. S2#show lacp internal to view local LACP information Flags: S-DeviceisrequestingSlowLACPDUs F -Device is requesting Fast LACPDUs A -Device is in Active mode P -Device is in Passive mode Channel group 1 LACP port Admin Oper Port Port Port Flags State Priority Key Key Number State FaO/13 SP bndl 32768 0x1 0x1 0x110 0x3C FaO/14 SP bndl 32768 0x1 0x1 0x111 0x3C The above output shows the LACP information of switch S2 itself, where S in SP in the Flags field indicates that the device In the Flags field, the S in SP indicates that the device is sending LACP packets at Slow speed (Slow), the P indicates that the LACP mode is Passive, and the Status field shows the aggregation status of the switch port. bndl indicates successful link aggregation. The above output also shows the LACP port priority, management key, operation key, port number and port status of this switch port. (7) Configuring Layer 3 EtherChannel McConfigure the cross-roach Sl(config)#no interface port-channel 1 S1 (config)#interface port-channel 1 Sl(config-if)#no switchport Configure the port as a Layer 3 interface S1 (config-if)#ip address 172.16.12.1 255.255.255.0 Sl(config-if)#exit S1 (config)#default interface range fastEthernetO/13 -14 S1 (config)#interface range fastEthernetO/13 -14 S1 (config-if-range)#no switchport S1 (config-if-range)#channel-protocol lacp S1 (config-if-range)#channel-group 1 mode active Configure switch S2. s2(config)#no interface port-channel 1 s2(config)#interface port-channel 1 s2(config-if)#no switchport s2(config-if)# ip address 172.16.12.2 255.255.255.0 S2(config-if)#exit