Use the link aggregation feature to aggregate one or more links to form a virtual link or link aggregation group LAG. The MAC client can treat this virtual link as if it were a single link to increase bandwidth, provide graceful degradation as failure occurs, and increase availability. LACP bundles several physical interfaces to form one logical interface.
When LACP is enabled, the local and remote sides of the aggregated Ethernet links exchange protocol data units PDUs , containing information about the state of the link.
One side of the link must be configured as active for the link to be up. The following sections provide a list of existing commands that were moved to new hierarchy levels or changed on EX Series switches as part of this CLI enhancement effort.
These sections are provided as a high-level reference only. For detailed information about these commands, use the links to the configuration statements provided or see the technical documentation. This section outlines the changes to the ethernet-switching-options hierarchy level. The ethernet-switching-options hierarchy level has been renamed as switch-options. The statements have been removed from the switch-options hierarchy. The port-error-disable statement has been replaced with a new statement.
Statements have moved from the ethernet-switching-options hierarchy level to the forwarding-options hierarchy level. The Layer 2 control protocol statements have moved from the ethernet-switching-options hierarchy to the protocols hierarchy. The dot1q-tunneling statement has been replaced with a new statement and moved to a different hierarchy level. The mac-table-aging-time statement has been replaced with a new statement and moved to a different hierarchy level.
The nonstop-bridging statement has moved to a different hierarchy level. The statement examine-dhcp does not exist in the changed hierarchy. Starting with Junos OS Release Statement is replaced with a new statement and has moved to a different hierarchy level. These statements have been removed. You can assign interfaces to a VLAN using the [edit interfaces interface-name unit logical-unit-number family ethernet-switching vlan members vlan-name ] hierarchy.
For layer2-protocol-tunneling MAC rewrite enabled on an interface :. Storm control is configured in two steps. The first step is to create a storm control profile at the [edit forwarding-options] hierarchy level, and the second step is to bind the profile to a logical interface at the [edit interfaces] hierarchy level.
Table 18 and Table 19 provide lists of existing commands that have been moved to new hierarchies or changed on SRX Series devices as part of this CLI enhancement effort. The tables are provided as a high-level reference only. For detailed information about these commands, see CLI Explorer. Table 20 shows the differences in CLI hierarchy for configuring Layer 2 features in Layer 2 next generation mode. Table 21 shows the differences in show commands for Layer 2 features in Layer 2 next generation mode.
Help us improve your experience. Let us know what you think. Do you have time for a two-minute survey? Maybe Later. Layer 2 Networking. Note: Link aggregation is not supported on NFX devices.
Note: Storm control is not supported on NFX devices. Ethernet Switching and Layer 2 Transparent Mode Overview Layer 2 transparent mode provides the ability to deploy the firewall without making changes to the existing routing infrastructure. Note: The IRB interface is a pseudointerface and does not belong to the reth interface and redundancy group.
The following security features are supported for IPv6 traffic in transparent mode: Layer 2 security zones and security policies. Layer 2 transparent mode chassis clusters. Note: If the primary device fails in a Layer 2 transparent mode chassis cluster, the physical ports in the failed device become inactive go down for a few seconds before they become active come up again. Junos OS Release See Also global-mode Protocols. Understanding Unicast Unicasting is the act of sending data from one node of the network to another.
Understanding Layer 2 Broadcasting on Switches In a Layer 2 network, broadcasting refers to sending traffic to all nodes on a network. To configure a VLAN:. Configuring Layer 2 Interfaces To ensure that your high-traffic network is tuned for optimal performance, explicitly configure some settings on the switch's network interfaces. To configure a Gigabit Ethernet interface or a Gigabit Ethernet interface as a trunk interface: [edit] user host set interfaces interface-name unit logical-unit-number family ethernet-switching interface-mode trunk To configure a Gigabit Ethernet interface or a Gigabit Ethernet interface as a access interface: [edit] user host set interfaces interface-name unit logical-unit-number family ethernet-switching interface-mode access To assign an interface to VLAN: [edit interfaces] user host set interface-name unit logical-unit-number family ethernet-switching vlan members [all vlan-names vlan-ids].
To specify an IP4 address for the logical unit: [edit] user host set interfaces interface-name unit logical-unit-number family inet address ip-address You represent IP version 6 IPv6 addresses in hexadecimal notation by using a colon-separated list of bit values. To specify an IP6 address for the logical unit: [edit] user host set interfaces interface-name unit logical-unit-number family inet6 address ip-address. To configure an IRB interface:. To configure an aggregated Ethernet interface:.
To configure LACP: Enable one side of the aggregated Ethernet link as active: [edit interfaces] user host set ae x aggregated-ether-options lacp active Specify the interval at which the interfaces send LACP packets: [edit interfaces] user host set ae x aggregated-ether-options lacp periodic interval. Changes to the ethernet-switching-options Hierarchy Level This section outlines the changes to the ethernet-switching-options hierarchy level. Note: The ethernet-switching-options hierarchy level has been renamed as switch-options.
Changes to the Port Mirroring Hierarchy Level Note: Statements have moved from the ethernet-switching-options hierarchy level to the forwarding-options hierarchy level.
Changes to the Layer 2 Control Protocol Hierarchy Level The Layer 2 control protocol statements have moved from the ethernet-switching-options hierarchy to the protocols hierarchy. Changes to the dot1q-tunneling Statement The dot1q-tunneling statement has been replaced with a new statement and moved to a different hierarchy level.
Changes to the L2 Learning Protocol The mac-table-aging-time statement has been replaced with a new statement and moved to a different hierarchy level. Changes to Nonstop Bridging The nonstop-bridging statement has moved to a different hierarchy level.
Note: The statement examine-dhcp does not exist in the changed hierarchy. Note: DHCP snooping statements have moved to a different hierarchy level. Note: Statement has been replaced with a new statement. Changes to Storm Control Profiles Storm control is configured in two steps. Changes to the Interfaces Hierarchy Note: Statements have been moved to a different hierarchy. Table Enhanced Layer 2 Operational Command Changes Original Operational Command Modified Operational Command clear bridge mac-table clear ethernet-switching table clear bridge mac-table persistent-learning clear ethernet-switching table persistent-learning show bridge domain show vlans show bridge mac-table show ethernet-switching table show l2-learning interface show ethernet-switching interface.
Transparent mode. Prior to Junos OS Release Switching mode. Transparent bridge mode. Note: The port-error-disable statement has been replaced with a new statement. Note: Statement is replaced with a new statement and has moved to a different hierarchy level. Statements have been removed. Note: Syntax is changed. Statement is removed. Ingress traffic is automatically tracked.
Statement has been moved to different hierarchy. Statement has been removed. Twisted-pair cables can also be shielded to prevent EMI. Shielding can be applied to each pair of wires, to the whole cable not the individual pairs or to both the pairs and the whole cable.
Ethernet standards the Ethernet cabling is typically sold under a category system defined by the Telecommunications Industry Association TIA. The category defines the physical properties of the cable and will support multiple Ethernet standards e. Cables belonging to these categories are commonly but not exclusively used for Ethernet data. The network devices on either end will transmit the data using an LED or a laser and receive it using a photodetector.
Fibre optic cables can generally support higher data speeds than copper. The fibre optic core is surrounded by cladding in order to create the correct refractive properties for sending light along the fibre. What are the properties of multi-mode fibre optics?
Give the properties of single mode fibre optics. What type of connector is used to terminate modern copper Ethernet cables? Which of the following cable categories offers the best performance in terms of supported speed and reduction of interference? What is the purpose of twisting pairs of wire together in Ethernet cables?
To reduce crosstalk and other electromagnetic interference EMI. What is the maximum speed supported by Category 6a Cat 6a cable? Which of the following is not supported by Category 5 Cat 5 cable? The Institute of Electrical and Electronics Engineers. Viewed 23k times. Just wondering. Improve this question. Why is this being voted off-topic? A question about networking sure seems like it belongs on serverfault. I Agree with Zoredache.
Should stay open. Add a comment. Active Oldest Votes. Improve this answer. Chris S Chris S Layer 2. Tatas Tatas 2, 1 1 gold badge 13 13 silver badges 19 19 bronze badges.
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