port fast

Unanswered Question
May 11th, 2009

I have a spaning tree configured on 4 switches that end user are connected to. I have spaning tree enabled, end user are complening of delay of audio coming to the wrk-station , I would like to see if the interfaces are configured for port fast when I do "sho ip int brief" .. there is no indication that in there that will suggest that port is fastport

Thanks

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Overall Rating: 4.3 (6 ratings)
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John Blakley Mon, 05/11/2009 - 10:09

You can do:

sh spanning-tree | inc P2p Edge

The results that you get back are the ones that have "spanning-tree portfast" configured on their interfaces.

HTH,

John

cisco steps Mon, 05/11/2009 - 10:13

Jhon,

I put in the command and the result is noting

sw#sh spanning-tree | i P2p edge

sw#

John Blakley Mon, 05/11/2009 - 10:21

Oh, and "edge" has a capital "E"

try again with:

sh spanning-tree | i P2p Edge

You may still not have anything though.

lamav Mon, 05/11/2009 - 10:17

Hi:

Depending on the switch you are using, you should be able to see the portfast configuration under each switch port when you do a "sh run".

For example:

interface FastEthernet1/0/25

description VLAN_54_sw_port

switchport

switchport access vlan 54

switchport mode access

no ip address

no mdix auto

spanning-tree portfast

HTH

Victor

John Blakley Mon, 05/11/2009 - 10:20

And as Victor said, you can manually look through all of the interfaces. You may not have it enabled at all on any of the interfaces.

John

cisco steps Mon, 05/11/2009 - 10:34

here is my config

sw#sho int fa0/2

FastEthernet0/2 is up, line protocol is up

Hardware is Fast Ethernet, address is 000b.5f51.fec2 (bia 000b.5f51.fec2)

MTU 1500 bytes, BW 100000 Kbit, DLY 1000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s

input flow-control is off, output flow-control is off

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

Last input never, output 00:00:01, output hang never

Last clearing of "show interface" counters 10w5d

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

Queueing strategy: fifo

Output queue :0/40 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

22517472 packets input, 339072620 bytes, 0 no buffer

Received 79356 broadcasts, 0 runts, 0 giants, 0 throttles

3 input errors, 3 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 0 multicast, 0 pause input

0 input packets with dribble condition detected

50344603 packets output, 457267010 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 PAUSE output

0 output buffer failures, 0 output buffers swapped out

================================================================

sw#sho spanning-tree active

VLAN0001

Spanning tree enabled protocol ieee

Root ID Priority 24577

Address 000b.5f51.f0c0

Cost 19

Port 23 (FastEthernet0/23)

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)

Address 000b.5f51.fec0

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Port ID Designated Port ID

Name Prio.Nbr Cost Sts Cost Bridge ID Prio.Nbr

---------------- -------- --------- --- --------- -------------------- --------

Fa0/1 128.1 19 FWD 19 32769 000b.5f51.fec0 128.1

Fa0/2 128.2 19 FWD 19 32769 000b.5f51.fec0 128.2

Fa0/3 128.3 19 FWD 19 32769 000b.5f51.fec0 128.3

Fa0/4 128.4 19 FWD 19 32769 000b.5f51.fec0 128.4

Fa0/5 128.5 19 FWD 19 32769 000b.5f51.fec0 128.5

Fa0/6 128.6 19 FWD 19 32769 000b.5f51.fec0 128.6

Interface Port ID Designated Port ID

Name Prio.Nbr Cost Sts Cost Bridge ID Prio.Nbr

---------------- -------- --------- --- --------- -------------------- --------

Fa0/7 128.7 19 FWD 19 32769 000b.5f51.fec0 128.7

Fa0/8 128.8 19 FWD 19 32769 000b.5f51.fec0 128.8

Fa0/9 128.9 19 FWD 19 32769 000b.5f51.fec0 128.9

Fa0/10 128.10 19 FWD 19 32769 000b.5f51.fec0 128.10

Fa0/11 128.11 19 FWD 19 32769 000b.5f51.fec0 128.11

Fa0/12 128.12 19 FWD 19 32769 000b.5f51.fec0 128.12

Fa0/13 128.13 19 FWD 19 32769 000b.5f51.fec0 128.13

Fa0/14 128.14 19 FWD 19 32769 000b.5f51.fec0 128.14

Fa0/15 128.15 19 FWD 19 32769 000b.5f51.fec0 128.15

Fa0/16 128.16 19 FWD 19 32769 000b.5f51.fec0 128.16

Fa0/18 128.18 19 FWD 19 32769 000b.5f51.fec0 128.18

Fa0/22 128.22 19 BLK 19 28673 000b.5fae.c080 128.22

Fa0/23 128.23 19 FWD 0 24577 000b.5f51.f0c0 128.23

John Blakley Mon, 05/11/2009 - 10:37

I'm going to "assume" that you don't have spanning-tree disabled on any of these ports. Now back to your original problem of "delay in audio", I highly doubt that would be a problem with spanning-tree to begin with. What are they using for audio? Are these phones, video conferencing devices, soft phones? I could be an issue with QoS.

HTH,

John

cisco steps Mon, 05/11/2009 - 10:46

a call comes to DMX 100 as x25 traffic then it get carry on to voice front node and then get converted to tcp and then gets connected to CISCO as 5350 voice getway the is connected to a LAN switches that all wrkstation are connected too. Hope this helps

Thanks again

Jon Marshall Mon, 05/11/2009 - 10:38

Try looking at the output of

"sh run interface fa0/2"

and see if has "spanning-tree portfast" in the config.

Jon

cisco steps Mon, 05/11/2009 - 10:41

interface FastEthernet0/2

no ip address

no logging event link-status

spanning-tree portfast

John Blakley Mon, 05/11/2009 - 10:43

Well, there goes my assumption :)

Is this the only port that you are concerned with? If you need to see all, just look through "show run."

HTH,

John

cisco steps Mon, 05/11/2009 - 10:49

John , That means port fast is enabled if I see it on all the interfaces. right ?

Thanks

cisco steps Mon, 05/11/2009 - 10:50

a call comes to DMX 100 as x25 traffic then it get carry on to voice front node and then get converted to tcp and then gets connected to CISCO as 5350 voice getway the is connected to a LAN switches that all wrkstation are connected too. Hope this helps

Thanks again

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