Interface Support, Configuration, and Monitoring4-*
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EX-series Interfaces
Network interfaces
24 or 48 Ethernet ports, copper or fiber, depending on the model
Uplink interfaces
4x1 Gigabit Ethernet SFPs or 2x10 Gigabit Ethernet XFPs
4x1 Gigabit Ethernet ports and 4 highest-numbered network ports are mutually exclusive on EX 3200 models (20+4 or 44+4)
Typical uses include:
Virtual Chassis extender port—2X10 Gigabit Ethernet ports (EX 4200)
Management Ethernet interface
Loopback interface
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Based on a type-slot/pic/port model, where:
type = The interface media type (ge and xe)
slot = The slot number; all standalone switches use slot 0, member switches within a Virtual Chassis system use the member ID
pic = The PIC number, fixed interfaces use 0, uplink modules use 1
port = The port number
Example 3:
Logical units are like subinterfaces in other vendor’s equipment
In JUNOS software, a logical unit is always required
Logical units support multiple protocol addresses
Typing in additional addresses does not override previous address
Watch for multiple addresses when correcting addressing mistakes!
ge-0/0/14.0
Link mode (half duplex, full duplex)
MAC address
Addresses
interfaces {
interface-name {
physical-properties;
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Configuration Options
You can configure network interfaces for Layer 2 or Layer 3 operation
Protocol family determines operational layer and is configured under the logical unit hierarchy level
Use family ethernet-switching for Layer 2 (default)
Use family inet for Layer 3
[edit interfaces ge-0/0/10 unit 0]
user@switch# set family ?
[edit interfaces ge-0/0/10]
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Protocol family inet used for Layer 3 interfaces
[edit interfaces ge-0/0/10]
Command options include terse, brief, detail, and extensive
Details displayed vary depending on the command option used
Use the interface name option to view details for a specific interface
user@switch> show interfaces ge-0/0/10 ?
detail Display detailed output
extensive Display extensive output
media Display media information
statistics Display statistics and detailed output
terse Display terse output
| Pipe through a command
Terse Output Example
Use the show interfaces terse command to quickly view the state of all physical and logical interfaces
user@switch> show interfaces terse
…
ge-0/0/11 up up
Extensive Output Example
Use the show interfaces extensive command to view interface status, physical and logical properties, and interface statistics
Useful tool when troubleshooting interfaces
user@switch> show interfaces ge-0/0/11 extensive
Physical interface: ge-0/0/11, Enabled, Physical link is Up
Interface index: 140, SNMP ifIndex: 23, Generation: 192
Link-level type: Ethernet, MTU: 1514, Speed: Auto, MAC-REWRITE Error: None,
Loopback: Disabled, Source filtering: Disabled, Flow control: Enabled,
Auto-negotiation: Enabled, Remote fault: Online
Device flags : Present Running
Link flags : None
Hold-times : Up 0 ms, Down 0 ms
Current address: 00:19:e2:55:36:0c, Hardware address: 00:19:e2:55:36:0c
Last flapped : 2008-07-15 04:33:27 UTC (08:32:47 ago)
…
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Monitoring Interfaces
Use the monitor interface interface-name command to view interface usage details in real time:
switch Seconds: 14 Time: 05:37:02
Delay: 26/0/29
Encapsulation: Ethernet, Speed: 10mbps
Traffic statistics: Current delta
Error statistics:
Policed discards: 0 [0]
L3 incompletes: 0 [0]
L2 mismatch timeouts: 0 Carrier transiti [0]
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802.3ad Link Aggregation
Definition: Method of grouping multiple Ethernet interfaces to form a single link layer interface, also known as a link aggregation group (LAG) or bundle
Uses 802.3ad LACP as its discovery protocol
Participating interfaces are known as member links
Commonly used to aggregate trunk links
Usage and benefits:
Up to eight member links per LAG
Up to 64 LAGs are supported on the EX 4200 switch, and up to 32 LAGs are supported on the EX 3200 switch
Member links can be on different Virtual Chassis system members
Member links are not required to be contiguous ports
Software:
IP traffic hashing uses Layer 2, Layer 3, and Layer 4
Non-IP traffic hashing uses source and destination MAC addresses
CPU control packets are always sent on the lowest member link
LACP mode can be set to active or passive
Active mode initiates transmission of LACP packets; at least one device must be configured for active mode
Passive mode responds to LACP packets
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[edit chassis]
user@switch# show
Creates logical aggregated Ethernet interface (ae0)
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[edit interfaces]
user@switch# show
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Monitoring a LAG
Use the show interfaces output to determine state information for aggregated interfaces
user@switch> show interfaces terse |match ae0
ge-0/0/10.0 up up aenet --> ae0.0
ge-0/0/11.0 up up aenet --> ae0.0
ge-0/0/12.0 up up aenet --> ae0.0
ae0 up up