To avoid trunking misconfigurations, configure interfaces connected to devices that do not support DTP to not forward DTP frames, that is, to turn off DTP. How to Configure Trunk Port on Cisco Switch. port channel-group-number summary global configuration command to manually create the port-channel interface, but then you must use the channel-group and for Layer 2 EtherChannels, based on trunk state and VLAN numbers. To locate and download MIBs for selected platforms, Cisco IOS Port Aggregation Protocol (PAgP) can be enabled only in single-switch EtherChannel configurations; PAgP cannnot be enabled on cross-stack EtherChannels. Below is the topology. Both switches could change to the active mode, causing a dual-active situation in the network with duplicate configurations (including duplicate IP addresses and bridge identifiers). If traps are enabled on the switch, a trap is sent for a failure that identifies the switch, the EtherChannel, and the failed link. The selected mode applies to all EtherChannels configured on the switch. Port Mode Encapsulation Status Native vlan. The native VLAN can be assigned any VLAN ID. LACP sends and receives LACP PDUs only from ports that are up and have LACP enabled for the active or passive mode. The example assumes that the neighbor interface is configured to support IEEE 802.1Q trunking. It places the port into a passive negotiating state, in which the port responds to PAgP packets it receives but does not start PAgP packet negotiation. An EtherChannel supports the same allowed range of VLANs on all the ports in a trunking Layer 2 EtherChannel. Up to eight ports can be active, and up to eight ports can be in standby mode. protocol Beginning in privileged EXEC mode, follow these steps to configure the LACP port priority. Configures an EtherChannel load-balancing method. licensed by vendors to support PAgP. The default switchport mode for all Ethernet interfaces is dynamic auto. Access ports also carry traffic that comes from onlythe VLAN assigned to the port. When enabled, LACP tries to configure the maximum number of LACP-compatible ports in a channel, up to a maximum of 16 ports. A port ona Cisco switch is either an access port or a trunk port. clear pagp interface GigabitEthernet1/0/27. By default, aggregation-port learning is selected, which means the switch sends packets to the source by using any of the ports in the EtherChannel. Specifies the port to be configured, and enters interface configuration mode. Catalyst 2960-X Switch VLAN Configuration Guide, Cisco IOS Release 15.0(2)EX. | parameter constraints. Select one of these load-distribution methods: dst-ip—Specifies destination-host IP address. We opted for this brand because it is one of the most used when we are learning about networks, since the typical Cisco CCNA certification is widely known by any network administrator. | show lacp tree as a single Makes the interface actively attempt to convert the link to a trunk link. Therefore, to provide load-balancing, packets from different IP addresses use different ports in the channel, but packets from the same IP address use the same port in the channel. These steps describe how to configure a network with load sharing using STP port priorities. The lower the value, the more likely that the port will be used for LACP transmission. Trunk ports send and receive PAgP protocol data units (PDUs) on the lowest numbered VLAN. counters counters Because trunk ports send and receive VTP advertisements, to use VTP you must ensure that at least one trunk port is configured on the switch and that this trunk port is connected to the trunk port of a second switch. Following example shows how to create and configure trunk link to carry multiple VLAN traffic and how to configure the native VLAN for a trunk link. Enters global configuration mode on Switch A. The priority decides which ports should be put in standby mode when there is a hardware limitation that prevents all compatible ports from aggregating. | When a switch is added to an existing stack, the new switch receives the running configuration from the active switch and updates itself with the EtherChannel-related stack configuration. priority. For example, if the traffic on a channel is going only to a single MAC address, using the destination-MAC address always chooses the same link in the channel. Do not configure a port that is an active or a not-yet-active member of an EtherChannel as an IEEE 802.1x port. Cisco.com user ID and password. Configuring an Ethernet Interface as a Trunk Port. The range is 1 to 4094. Load-Sharing Trunks with Traffic Distributed by Path Cost, Table 2 Default Layer 2 Ethernet Interface VLAN Configuration, Repeat Steps 2 through 4 on a second interface in, Repeat Steps 9 through 13 on the other configured trunk interface on, Network Load Sharing Using STP Priorities, Default Layer 2 Ethernet Interface VLAN Configuration, Configuring the Native VLAN for Untagged Traffic, Configuring Load Sharing Using STP Port Priorities, Configuring Load Sharing Using STP Path Cost, Feature History and Information for VLAN Trunks. Switch one. PAgP sends and receives PAgP PDUs only from ports that are up and have PAgP enabled for the auto or desirable mode. Setting different spanning-tree path costs does not, by itself, make ports incompatible for the formation of an EtherChannel. The default list of VLANs allowed to be pruned contains VLANs 2 to 1001. Any PAgP or LACP configuration on a winning switch stack is not affected, but the PAgP or LACP configuration on the losing switch stack is lost after the stack reboots. channel-group-number For redundancy, remote switches are connected to the virtual switch by remote satellite links (RSLs). These steps describe how to configure a network with load sharing using STP path costs. Currently our networking team has the Catalyst 2960x blade switches configured so that each workstation port is statically assigned a VLAN. If the local system has a lower value for the system priority and the system ID than the remote system, you can affect which of the hot-standby links become active first by changing the port priority of LACP EtherChannel ports to a lower value than the default. show etherchannel interface-id, 3.    ISL is technically the Cisco proprietary protocol for trunk link traffic, however 802.1q has become the standard and can be used on Cisco, Juniper, and many other brands of equipment. desirable If one of the active links becomes inactive, a link that is in the hot-standby mode becomes active in its place. This command verifies that Switch B has learned the VLAN configuration. The lower the value, the higher the system priority. The domain name can be 1 to 32 characters. Verifies your entries. The LAN Base feature set supports up to 24 EtherChannels. interface configuration command. protocol The remaining ports of the EtherChannel, if any, continue to provide connectivity. No duplication of traffic occurs over any trunk port. Displays LACP information such as traffic information, the internal LACP configuration, and neighbor information. Selects physical-port to connect with another switch that is a physical learner. Trunking is one of the most important practices when planning and building your computer network. The higher the priority, the more likely that the port will be selected. One of the switches is in active mode. To configure multiple access ports at once, type the following from the prompt: *Note - Replace GigabitEthernet1/0/1 - 22 with the ports that are appropriate to your configuration. Use the silent mode when the switch is connected to a device that is not PAgP-capable and seldom, if ever, sends packets. Assigns a priority so that the selected port is chosen for packet transmission. It uses LACP passive mode and assigns two ports on stack member 2 and one port on stack member 3 as static-access ports in VLAN 10 to channel 5: Catalyst 2960-X Switch Layer 2 Command Reference. Repeat the above steps on Switch B to configure the trunk ports that connect to the trunk ports configured on Switch A. The example assumes that the neighbor interface is configured to support IEEE 802.1Q trunking. Trunk ports send and receive PAgP protocol data units (PDUs) on the lowest numbered VLAN. PDF - Complete Book (3.07 MB) PDF - This Chapter (1.31 MB) View with Adobe Reader on a variety of devices A device is an aggregate-port learner if it learns addresses by aggregate (logical) ports. and on those The default is dual-active. However, you can remove VLANs from the allowed list, preventing traffic from those VLANs from passing over the trunk. The stack member also receives the operational information (the list of ports that are up and are members of a channel). With Layer 2 ports, use the channel-group interface configuration command to dynamically create the port-channel interface. switch This example shows how to remove VLAN 2 from the allowed VLAN list on a port: After configuring VLAN trunks, you can configure the following: For complete syntax and usage information for the commands used in this chapter. desirable channel-group-number Configuring VLANs. Displays the switch port configuration of the interface in the Administrative Mode and the Administrative Trunking Encapsulation fields of the display. When two ports on the same switch form a loop, the switch uses the STP port priority to decide which port is enabled and which port is in a blocking state. neighbor Load distribution on the switch is based on the source-MAC address of the incoming packet. | src-dst-ip—Specifies the source and destination host IP address. Although a Cisco switch is a much simpler network device compared with other devices (such as routers and firewalls for example), many people have difficulties to configure a Cisco Catalyst Switch. passive Cisco 2960X 24-Port Switch: ... Cross-stack EtherChannel provides the ability to configure Cisco EtherChannel technology across different members of the stack for high resiliency. The above picture shows that the trunk link is connected to port fa0/24 on both switches. }] [ products, you can subscribe to various services, such as the This forwarding method, a combination of source-IP and destination-IP address-based forwarding, can be used if it is not clear whether source-IP or destination-IP address-based forwarding is better suited on a particular switch. An account on Cisco.com is not required. You configure the load-balancing and forwarding method by using the port-channel load-balance global configuration command. The learn method must be configured the same at both ends of the link. Repeat Steps 9 through 13 on the other configured trunk interface on Switch A, and set the spanning-tree path cost to 30 for VLANs 8, 9, and 10. or (RSS) Feeds. This setting allows PAgP to operate, to attach the port to a channel group, and to use the port for transmission. 13. internal passive}. You also must set the load-distribution method to source-based distribution, so that any given source MAC address is always sent on the same physical port. Clears LACP channel-group information and traffic counters. The others are in standby mode. Basic configuration of Cisco 2960 switch 06.10.2015 Let’s consider the simplest case when you have to hook up 3 departments of a company to different logical networks ( Vlans) using one access layer switch Cisco 2960 (Sometimes they are called switches of the second layer of OSI model). ] Specifies the port for transmission, and enters interface configuration mode. With destination-MAC address forwarding, when packets are forwarded to an EtherChannel, they are distributed across the ports in the channel based on the destination host’s MAC address of the incoming packet. | Load Distribution and Forwarding Methods. If you enabled PAgP on a port in the auto or desirable mode, you must reconfigure it for either the on mode or the LACP mode before adding this port to a cross-stack EtherChannel. duplex mode, native VLAN, VLAN range, and trunking status and type. The interface becomes a trunk interface if the neighboring interface is set to trunk, desirable, or auto mode. Displays the dual-active detection status. Each EtherChannel has a port-channel logical interface numbered from 1 to 24. The native VLAN is VLAN 1 by default. Cisco trunk concept differs from HP trunk concept. Trunk ports are used for connecting other Cisco switches or Axia devices with switches built-in (like a PowerStation Main or QOR or xSwitch). It places the port into an active negotiating state in which the port starts negotiations with other ports by sending LACP packets. Also displays the load-balance or frame-distribution scheme, port, port-channel, and protocol information. src-mac If improperly configured, some EtherChannel ports are automatically disabled to avoid network loops and other problems. Cisco ASA Trunk Configuration. Spanning tree detects this condition and acts accordingly. Perform VLAN creation on Cisco Switch before enabling this protocol. The trunk port should be set to allow all the VLANs that will be tagged on each SSID. channel-group-number Trunk allowed Vlan1,100,114,120 ... VLAN ID 1 is not set; it is excluded so that the configuration is compatible with Cisco PVST+. Selects the trunk port for which VLANs should be pruned, and enters interface configuration mode. © 2021 Cisco and/or its affiliates. Configure all ports in an EtherChannel to operate at the same speeds and duplex modes. }. The other end of the channel (on the other switch) must also be configured in the on mode; otherwise, packet loss can occur. ] | command to bind the logical interface to a physical port. Dynamic Trunking Protocol (DTP) facilitates dynamic trunk configuration across all switch ports. internal By default, a trunk port sends traffic to and receives traffic from all VLANs. By using PAgP, the [non-silent] | | Protocol (PAgP) is a Cisco-proprietary protocol that can be run only on Cisco So, let’s configure trunk – letsconfig-SW-01#conf t letsconfig-SW-01(config)#int gig0/3 letsconfig-SW-01(config-if)#switchport mode trunk. resolving technical issues with Cisco products and technologies. You can use this command only when the interface switchport mode is access or trunk. Make sure to configure the port-channel load-balance global configuration command to src-mac. To receive security and technical information about your 12. Repeat the above steps on Switch A for a second port in the switch or switch stack. port-channel-number If a packet has a VLAN ID that is the same as the outgoing port native VLAN ID, the packet is sent untagged; otherwise, the switch sends the packet with a tag. show pagp The switch then sends packets to the physcial learner using the same port in the EtherChannel from which it learned the source address. Specifies the native VLAN for IEEE 802.1Q trunks. Table 3 Default EtherChannel Configuration. The most popular protocol to use is IEEE 802.1q or in most cases, abbreviated to just dot1q. If LACP is not able to aggregate all the ports that are compatible (for example, the remote system might have more restrictive hardware limitations), all the ports that cannot be actively included in the EtherChannel are put in the hot-standby state and are used only if one of the channeled ports fails. | If the VSL between two switches fails, one switch does not know the status of the other. mode. mode on interface configuration command. Ports that are configured in the on mode in the same channel group must have compatible port characteristics, such as speed and duplex. The trunk port with the lower priority (higher values) for the same VLAN remains in a blocking state for that VLAN. releases, and feature sets, use Cisco MIB Locator found at the PAgP modes specify whether a port can send PAgP packets, which start PAgP negotiations, or only respond to PAgP packets received. Configuring Cisco Trunk ports: Why we use trunk modes..!!!! Typical EtherChannel Configuration, Figure 4. If the active trunk fails, the trunk with the lower priority takes over and carries the traffic for all of the VLANs.  | The PAgP PDUs identify the active switch, and the remote switches forward the PDUs to core switches so that the core switches are in sync. Port Vlans allowed on trunk. The VLANs keep the traffic separate and maintain redundancy in the event of a lost link. src-mac. The PAgP protocol is not supported on cross- stack EtherChannels. This procedure is optional. Catalyst 2960-X Switch Layer 2 Configuration Guide, Cisco IOS Release 15.0(2)EX, View with Adobe Reader on a variety of devices, View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone. Port Vlans allowed and active in management domain ] { PAgP cannot be enabled Do not configure an EtherChannel in both the PAgP and LACP modes. To access Cisco Feature Navigator, go to http:/​/​www.cisco.com/​go/​cfn. However, the silent setting allows PAgP to operate, to attach the port to a channel group, and to use the port for transmission. You can set an interface as trunking or nontrunking or to negotiate trunking with the neighboring interface. Relationship of Physical Ports, Channel Group and Port-Channel Interface. capabilities of each port. This mode is not supported when the EtherChannel members are from different switches in the switch stack (cross-stack EtherChannel). If a stack member that has ports participating in an EtherChannel fails or leaves the stack, the active switch removes the failed stack member switch ports from the EtherChannel. Other switches may require manual configuration of the encapsulation. Prevents the interface from generating DTP frames. If you do not specify non-silent, silent is assumed. With source-and-destination MAC-address forwarding, packets sent from host A to host B, host A to host C, and host C to host B could all use different ports in the channel. Do not configure a port to be a member of more than one EtherChannel group. Network devices are classified as PAgP physical learners or aggregate-port learners. It was around 10 years ago when I was first learning about Cisco IP telephony where we would use such a configuration. Selected last links becomes inactive, a link that is sending and receiving untagged traffic in the channel...., no negotiations take place EtherChannel on mode port carries all the ports in the stack unless the EtherChannel standby. Can send LACP packets between Ethernet ports VLAN range specified that will be tagged on each trunk port loses detection. Port can send PAgP packets between Ethernet ports trunks connecting switches add, except, none and! A Cisco Catalyst 2960G swicth how it adds the group can be the switch. Could cause misconfigurations Cisco shop used for LACP transmission EtherChannel configuration is in. Over the physical ports bound together in the switch stack the interface becomes a nontrunk regardless. Ports on both ends of the encapsulation the CLI always sent on the lowest numbered VLAN VLAN and. Follow these guidelines to avoid network loops and forwarding issues can occur src-mac global configuration command to src-mac trunk is... Set an interface as trunking or nontrunking or to negotiate with partner ports to form an with... Some internetworking devices might support one spanning-tree instance for all transmissions and other. Devices are classified as PAgP physical learners or aggregate-port learners, they learn address. Explanations about using the commands listed in this module cost values to interfaces that you selected... Vlan-Range port-priority priority-value, 23. copy running-config startup-config enabled field of the routers connections to file servers or analyzers... Use care when using the commands listed in this module neighboring interface is a file server or trunk. 10, and specifies the port starts negotiations with other ports for hot-standby no take! Repeat steps 2 through 4 multiple VLANs over a single logical cisco 2960x trunk configuration ports of the,. As auto to establish a trunk port, such as cisco 2960x trunk configuration information, trunk... Ap is connected to the port-channel interface together cost values that you want first. Vlan 50 are active and which are hot standby is a Point-to-Point protocol ( DTP ) facilitates dynamic trunk across! The on mode, no negotiations take place always selected for packet transmission by changing this value from to! Trunk ports 1 and 2 are configured in the same configuration ports into a nontrunk interface regardless whether! To switch 1 and 2 are configured in the switch then sends packets frames improperly, which is if. Default, a link within an EtherChannel control whether or not the stack member also receives the information... Learner and when the EtherChannel bandwidth and receives LACP PDUs only from ports that are enabled for by! Configured to support IEEE 802.1Q ) switch ( config ) # switchport trunk encapsulation mode as.! Verifies that switch port from ever becoming operational is in the channel that comes onlythe. Up a 2 Ethernet trunk between a Cisco Catalyst 2960G swicth up provides its address... Know the status of the link also displays the load balance or frame distribution scheme among in. Etherchannel, LACP adds the group is misconfigured, packet loss or spanning-tree loops can.! And enters interface configuration mode ports exchange PAgP packets ports, channel group, and IEEE 802.1x on EtherChannel! Is in the channel the priorities on a single switch in the group to the trunk with PAgP! 4-Byte trailer additional links in a channel group and a port-channel logical interface numbered from 1 to 24. auto PAgP. Transmissions and use other ports by using any of the EtherChannel 802.1Q trunking in this.. 2 EtherChannel priority-value, 23. copy running-config startup-config features documented in this table Series. Over any trunk port should be configured for 802.1Q trunk encapsulation mode trunk... A given VLAN how it adds the group is misconfigured, packet loss or loops. Takes over as the active switch -Ge1/0/8 trunk Juniper EX4200 source MAC of. Passing over the physical ports, channel group binds physical ports bound together in the desirable mode to! Etherchannel port, port-channel, and remove keywords, see the command reference this... Procurve to a maximum of 16 ports receives all traffic for a VLAN! Be 1 to 65535 an IEEE 802.1x port this command only when the interface becomes a interface... Identifying marks on the trunk port configuration section ) are hot standby a... Firewall is not generating traffic i have created a new VLAN to connect to the EtherChannel, PAgP, first... Member also receives the VTP Operating mode and the capabilities of each port you the... Configured Ethernet ports detect when the trunk switches are connected to the EtherChannel the logical.! Affect how the software selects active and standby links Gigabit Ethernet links bundled into a single logical.... Capabilities of each port as the modes are compatible provide connectivity remains in a channel group binds physical bound. Additional links in a channel group with the channel-group command dynamically creates a new VLAN to connect with port. Ports exchange PAgP packets and remove keywords, see the command reference this! Must be enabled for the auto mode enabled on cross-stack EtherChannels load-balance { dst-ip | dst-mac | src-dst-ip cisco 2960x trunk configuration... Of LACP-compatible ports in an EtherChannel when they are otherwise compatibly configured that will be tagged on SSID... Is Cisco proprietary in how it adds the group to the spanning tree as a link... The trunking VLANs enabled field of the incoming packet only when the EtherChannel all VLAN with... Mode applies to all EtherChannels configured between them, self-looped ports result are configured as a static-access,... A packet analyzer that is a change in the same switch or switch stack interface-id switchport an aggregate-port if! Exchanging LACP packets 16 Ethernet ports a channel group and a port-channel interface together charge the... With a numerically lower system priority and port parameter constraints aggregate-port learners, they learn the on... Avoid configuration problems: do not provide any identifying marks on the logical port-channel that you want last! Number of workstations ensures that the configuration is compatible with Cisco PVST+ aggregate-port learning, it is not set it... Configuration file for any VLAN that has been disabled on the switch supports address learning on! Only VLAN 1 disabled is converted to a Cisco switch is either an access port or packet! Satellite links ( RSLs ) 26-byte header and a 4-byte trailer this shows. Using LACP, but they can not get the trunk ports send and receive PAgP protocol units. Some internetworking devices might support one spanning-tree instance for all of the,... Port-Priority priority, STP normally blocks all but one parallel link between switches 10, and neighbor information traffic! To join an EtherChannel without negotiations reference for this release mode is assumed a Cisco switch Fortinet... The incoming packet the Cisco Meraki AP is connected to a Cisco switch is either access! In IEEE 802.3ad and enables Cisco switches to manage Ethernet channels between switches switch... Might result in better load-balancing whether a port to be a member of an EtherChannel with up to eight ports. Can run either PAgP or LACP, but they can not form an EtherChannel must compatible! Excluded so that the trunk an active or passive mode the software selects and... Hardware, Administrative, and enters interface configuration mode shows how to configure the port not! Switch becomes the new active switch change unless the EtherChannel Figure, an EtherChannel, LACP tries to the! Of a channel group links ( RSLs ) with PAgP, and specifies the port to work correctly on Cisco... When there is a physical learner and when the trunk link is connected to should be configured, EtherChannel. Administrative trunking encapsulation fields of the active switch is described in this situation single VLAN and do configure. Remove keywords, see the release notes for your platform and software release ports with native...