Monitoring the Status of Fast Ethernet Interfaces
Purpose
Display the status of Fast Ethernet interfaces. You
can use the delta keyword to view baselined
statistics. You can use the brief keyword
to view the operational status of all configured interfaces.
 | Note:
The E120 and E320 routers output for monitor and show commands is identical to output
from other E Series routers, except that the E120 and E320 router
output also includes information about the adapter identifier in the
interface specifier (slot/adapter/port). |
Action
To display the status of a Fast Ethernet interface:
host1:vr2#show interfaces fastEthernet 2/0
FastEthernet2/0 is Up, Administrative status is Up
Hardware is Intel 21440, address is 0090.1a10.0552
MAU is 10BASE-T
MTU: Operational 1518, Administrative 1518
Duplex Mode: Operational Full Duplex, Administrative Auto Negotiate
Speed: Operational 100 Mbps, Administrative Auto Negotiate
De-bounce: State is Enabled, interval is 2 seconds
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
In: Bytes 39256, Unicast 612
Multicast 0, Broadcast 0
Errors 0, Discards 0, Mac Errors 0, Alignment 0
CRC 0, Too Longs 0, Symbol Errors 0
Out: Bytes 4579036, Unicast 610
Multicast 0, Broadcast 70932
Errors 0, Discards 0, Mac Errors 0, Deferred 0, No Carrier 3
Collisions: Single 0, Multiple 0, Late 0, Excessive 0
ARP Statistics:
In: ARP requests 0, ARP responses 0
Errors 0, Discards 0
Out: ARP requests 0, ARP responses 0
Errors 0, Discards 0
Administrative qos-shaping-mode: none
Operational qos-shaping-mode: none
queue 0: traffic class control, bound to FastEthernet2/0
Queue length 0 bytes
Forwarded packets 1, bytes 46
Dropped committed packets 0, bytes 0
Dropped conformed packets 0, bytes 0
Dropped exceeded packets 0, bytes 0
Meaning
Table 1 lists the show interfaces fastEthernet command output fields.
Table 1: show interfaces
fastEthernet Output Fields
Field Name | Field Description |
|---|
FastEthernet interfaceSpecifier— | Status of the hardware on this interface: - up—Hardware is operational
- down—Hardware is not operational
|
Administrative status | Operational state that you configured for this interface: - up—Interface is enabled
- down—Interface is disabled
|
Hardware | Type of MAC device on this interface |
Address | MAC address of the processor on this interface |
MAU | Type of medium attachment unit (MAU) on the physical
port: - 10BASE-T (10 Mbps)
- 100BASE-TX (100 Mbps)
- 100BASE-FX-MM (100 Mbps) with the distance appearing
after the type
- 100BASE-LX-SM (100 Mbps)
- SFP (Empty)—SFPs that are empty
- SFP (Non-compliant Juniper Part)—SFPs that
are installed in the FE-8 I/O module and do not have a Juniper Networks
part number programmed
|
MTU | Size of the MTU for this interface: - Operational—Size of the largest packet processed
- Administrative—Setting for MTU size that you specified
|
Duplex Mode | Duplex option for this interface: - Operational—Duplex option currently used
- Administrative—Setting for duplex that you specified
|
Speed | Line speed for this interface: - Operational—Current rate at which packets are processed
- Administrative—Setting for line speed
- 5 minute input rate—Data rates based on traffic
received in the last 5 minutes
- 5 minute output rate—Data rates based on traffic
sent in the last 5 minutes
|
De-bounce | Debounce configuration for this interface: - State is—Enabled, Disabled
- Interval is—Number of seconds that this interface
maintains a given state before the state change is reported to the
upper-layer links
|
In | Analysis of inbound traffic on this interface: - Bytes—Number of bytes received in error-free packets
- Unicast—Number of unicast packets received
- Multicast—Number of multicast packets received
- Broadcast—Number of broadcast packets received
- Errors—Total number of errors in all received packets;
some packets might contain more than one error
- Discards—Total number of discarded incoming packets
- Mac Errors—Number of incoming packets discarded
because of MAC sublayer failures
- Alignment—Number of incomplete octets received
- CRC—Number of packets discarded because the checksum
the router computed from the data does not match the checksum generated
by the originating devices
- Too Longs—Number of packets discarded because the
size exceeded the MTU
- Symbol Errors—Number of symbols received that the
router did not correctly decode
|
Out | Analysis of outbound traffic on this interface: - Bytes—Number of bytes sent
- Unicast—Number of unicast packets sent
- Multicast—Number of multicast packets sent
- Broadcast—Number of broadcast packets sent
- Errors—Total number of errors in all transmitted
packets; some packets might contain more than one error
- Discards—Total number of discarded outgoing packets
- Mac Errors—Number of outgoing packets discarded
because of MAC sublayer failures
- Deferred—Number of packets that the router delayed
sending because the line was busy. In half duplex mode, a high number
of deferrals means the link is very busy with traffic from other stations.
In full duplex mode, when the link is always available for transmission,
this number is zero.
- No Carrier—Number of packets sent when carrier sense
was unavailable
|
Collisions | Analysis of the collisions that occurred: - Single—Number of packets sent
after one collision
- Multiple—Number of packets
sent after multiple collisions
- Late—Number of packets aborted
during sending because of collisions after 64 bytes
- Excessive—Number of packets
not sent because of too many collisions
|
ARP Statistics | Analysis of ARP traffic on this interface; In fields
are for traffic received on the interface and Out fields are for traffic
sent on the interface: - ARP requests—Number of ARP requests
- ARP responses—Number of ARP responses
- Errors—Total number of errors in all ARP packets
- Discards—Total number of discarded ARP packets
|
queue | Hardware packet queue associated with the specified traffic
class and interface: - Queue length—Length of the queue, in bytes
- Forwarded packets, bytes—Number of packets and bytes
that were forwarded on this queue
- Dropped committed packets, bytes—Number of committed
packets and bytes that were dropped
- Dropped conformed packets, bytes—Number of conformed
packets and bytes that were dropped
- Dropped exceeded packets, bytes—Number of exceeded
packets and bytes that were dropped
|
Published: 2012-06-19
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