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Router interface bandwidth

Pradeep H A
Beginner
Beginner

Hi,

The physical Gigabit interface in this router has bandwidth command set & the show interface command output reflects the same

But how does the Subinterface get its bandwidth set to 100 Mbps? I always thought subinterfaces inherit the physical interface bandwidth. isnt it?

Router#sh int GigabitEthernet0/0

GigabitEthernet0/0 is up, line protocol is up

  Hardware is BCM1125 Internal MAC, address is 64ae.0c98.ba10 (bia 64ae.0c98.ba10)

  Description: link to PE

  MTU 1500 bytes, BW 10000 Kbit/sec, DLY 100 usec,

     reliability 255/255, txload 4/255, rxload 33/255

  Encapsulation 802.1Q Virtual LAN, Vlan ID  1., loopback not set

  Keepalive set (10 sec)

  Full-duplex, 100Mb/s, media type is RJ45

  output flow-control is XON, input flow-control is XON

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:00, output 00:00:00, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 111823

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 1323000 bits/sec, 142 packets/sec

  5 minute output rate 177000 bits/sec, 96 packets/sec

     3331038420 packets input, 405011219 bytes, 0 no buffer

     Received 11024 broadcasts, 0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 0 multicast, 0 pause input

     0 input packets with dribble condition detected

     2480626113 packets output, 2746510267 bytes, 0 underruns

     1 output errors, 0 collisions, 3 interface resets

     0 unknown protocol drops

     0 babbles, 0 late collision, 0 deferred

     1 lost carrier, 0 no carrier, 0 pause output

     0 output buffer failures, 0 output buffers swapped out

Router#sh run int GigabitEthernet0/0

Building configuration...

Current configuration : 186 bytes

!

interface GigabitEthernet0/0

description link to PE

bandwidth 10000

no ip address

ip flow ingress

ip route-cache flow

duplex full

speed 100

media-type rj45

no cdp enable

end

Router#sh int GigabitEthernet0/0.2015

GigabitEthernet0/0.2015 is up, line protocol is up

  Hardware is BCM1125 Internal MAC, address is 64ae.0c98.ba10 (bia 64ae.0c98.ba10)

  Internet address is x.x.x.x/30

  MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,

     reliability 255/255, txload 4/255, rxload 32/255

  Encapsulation 802.1Q Virtual LAN, Vlan ID  2015.

  ARP type: ARPA, ARP Timeout 04:00:00

  Last clearing of "show interface" counters never

Router#sh run int GigabitEthernet0/0.2015

Building configuration...

Current configuration : 174 bytes

!

interface GigabitEthernet0/0.2015

encapsulation dot1Q 2015

ip address x.x.x.x 255.255.255.252

no cdp enable

service-policy output SE_SNAP_Q9000K_1M-0-7M-0_25

end