Port Channel - Sub Interface

Unanswered Question
Sep 24th, 2007
User Badges:

I'd like to know if is it possible to verify a traffic in a subinterface of a port-channel.


When I perform a show int portx.x the traffic is the same of the original port-channel


csco-dist-bnu01#sh interfaces port-channel 24

Port-channel24 is up, line protocol is up (connected)

Hardware is EtherChannel, address is 001a.302b.8fc0 (bia 001a.302b.8fc0)

Description: AGG: CONEXAO CISCO SW-SRV-BNU01 Po24

MTU 1500 bytes, BW 2000000 Kbit, DLY 10 usec,

reliability 255/255, txload 7/255, rxload 4/255

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

Keepalive set (10 sec)

Full-duplex, 1000Mb/s

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

Members in this channel: Gi5/1 Gi6/1

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 3d03h

Input queue: 0/75/226/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

30 second input rate 35956000 bits/sec, 12621 packets/sec

30 second output rate 62460000 bits/sec, 12637 packets/sec

L2 Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes

L3 in Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes mcast

L3 out Switched: ucast: 0 pkt, 0 bytes mcast: 0 pkt, 0 bytes

2671995130 packets input, 872035144522 bytes, 0 no buffer

Received 2829256 broadcasts (5231 IP multicasts)

0 runts, 881 giants, 8 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

2674646627 packets output, 1684498475854 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

csco-dist-bnu01#sh interfaces port-channel 24.101

Port-channel24.101 is up, line protocol is up (connected)

Hardware is EtherChannel, address is 001a.302b.8fc0 (bia 001a.302b.8fc0)

Description: CLIENTE:

Internet address is X.X.X.X/30

MTU 1500 bytes, BW 2000000 Kbit, DLY 10 usec,

reliability 255/255, txload 7/255, rxload 4/255

Encapsulation 802.1Q Virtual LAN, Vlan ID 101.

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

0 packets input, 0 bytes

0 packets output, 0 bytes

csco-dist-bnu01#




  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Loading.
Jon Marshall Mon, 09/24/2007 - 12:55
User Badges:
  • Super Blue, 32500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN

Hi Alexandre


I might have misunderstood your question but are you asking how to view the individual interfaces within a port-channel ?


If so


switch# sh etherchannel summary


This will show you the etherchannels and the individual ports/interfaces with each etherchannel. You can then run


sh int "interface"


on the individual interfaces.


Hope this has answered your question


Jon


azago Mon, 09/24/2007 - 12:59
User Badges:

Hi Jon,


I'd like to know how much traffic is passing on a subinterface of a portchannel.


If you see the show commands they only show the traffic on the main port-channel

Jon Marshall Mon, 09/24/2007 - 13:01
User Badges:
  • Super Blue, 32500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN

Hi


What do you mean by "subinterface" ?


Jon

terminal-ks Mon, 09/24/2007 - 15:23
User Badges:

2960#show ether sum

Flags: D - down P - in port-channel

I - stand-alone s - suspended

H - Hot-standby (LACP only)

R - Layer3 S - Layer2

U - in use f - failed to allocate aggregator

u - unsuitable for bundling

w - waiting to be aggregated

d - default port



Number of channel-groups in use: 6

Number of aggregators: 6


Group Port-channel Protocol Ports

------+-------------+-----------+-----------------------------------------------

1 Po1(SU) - Gi0/21(P) Gi0/22(P) Gi0/23(P)

Gi0/24(P)

2 Po2(SU) - Gi0/1(P) Gi0/2(P)

3 Po3(SD) - Gi0/3(D) Gi0/4(D)

4 Po4(SD) - Gi0/5(D) Gi0/6(D)

5 Po5(SD) - Gi0/7(D) Gi0/8(D)

6 Po6(SD) - Gi0/9(D) Gi0/10(D)


2960#show int gi0/1 | inc sec

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

Keepalive set (10 sec)

30 second input rate 548982000 bits/sec, 45760 packets/sec

30 second output rate 14256000 bits/sec, 26982 packets/sec

2960G-E#show int po2 | inc sec

MTU 1500 bytes, BW 2000000 Kbit, DLY 10 usec,

30 second input rate 1069103000 bits/sec, 89112 packets/sec

30 second output rate 27796000 bits/sec, 52549 packets/sec

2960#

Edison Ortiz Mon, 09/24/2007 - 20:19
User Badges:
  • Super Bronze, 10000 points or more
  • Hall of Fame,

    Founding Member

Collected from your output:


Members in this channel: Gi5/1 Gi6/1


If you want to know how much each interface is consuming, type:


show int g5/1

show int g6/1


HTH,



terminal-ks Tue, 09/25/2007 - 00:12
User Badges:

I am curious what po24.101 is.


It appears to be a completely separate portchannel, considering it has a separate vlan ID and appearing to be a routed interface while po24 appears to be L2.


Can you explain that a bit further? My understanding about the naming scheme of port-channels may be more limited than I thought and I believe that channel-groups could only include integers.


This raises other questions/research subjects for myself: Are you trying to see individual VLAN (vlan 101) traffic that passes over a specific port channel rather than find the physical interface (gi5/1 & gi6/1) throughput?

Jon Marshall Tue, 09/25/2007 - 02:55
User Badges:
  • Super Blue, 32500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN

Hi Keith


On the old 4006 switches you used to see this sort of configuration. Basically to set up inter-vlan routing you had a port-channel that was a link between the switch and the router within the 4006 chassis.


So with 4500/6500 you would


1) Create vlan at layer 2 ie


vlan 101


2) Create layer 3 SVI for the routing


interface vlan 101

ip address 192.168.5.1 255.255.255.0

no shut


On a 4006 you


1) Create vlan at layer 2


set vlan 101


2) Configure port-channel with vlan ID


interface po1.101

encapsulation dot1q

ip address 192.168.5.1 255.255.255.0



You have to use the vlan ID ie 101 as the subinterface.


It's really routing on a stick and it was a kind of halfway house before the later switches to be able to do inter-vlan routing on the switch.


I have only ever come across it on 4006 switches but it may be applicable on other switches.


It does raise a good question as you say.


Alexandre, could you be more specific as to what you are trying to find out ?


Jon



terminal-ks Tue, 09/25/2007 - 13:37
User Badges:

Thanks Jon


.... but now I'm confused even more!


Mind you, I only have CatOS experience through 2948s. His show interface call gives IOS responses, not what I am familiar with regarding the (2948) CatOS. So, with the information you provided, his po24.101 is thoroughly grinding me.


Perhaps the OP will saunter back in eventually and provide some insight.

terminal-ks Tue, 09/25/2007 - 13:48
User Badges:

Ignore. I guess I get it. All my portchannels on the 6500 are set to switchports, so they do not allow sub-ints.


To the OP, no idea! Sorry.

Actions

This Discussion