Re: Issue of the port channel in Cisco ASR1001x router

mmendis · ‎06-01-2022

We are using a port channel for our up streaming router (Cisco ASR1001x) and there is a problem after configuring the port channel of it. We used GigabitEthernet0 / 0/0 and GigabitEthernet0 / 0/1 to create that port channel. But there is no Rx traffic from GigabitEthernet0 / 0/1. Please refer the details below which we obtained from the router and advise on this matter.

Metro-ASR1001x[1.22]#sho interfaces description

Interface Status Protocol Description

Te0/0/0 up up

Te0/0/1 up up

Gi0/0/0 up up

Gi0/0/1 up up

Gi0/0/2 up up SLT-Primary | CCT:84780D |portchannel 2

Gi0/0/3 up up SLT-Primary | CCT:84780D |portchannel 2

Gi0/0/4 up up

Gi0/0/5 up up Uplink | 1.0 Range

Gi0 down down

Lo0 up up

Lo2 up up

Lo4 up up

Lo6 up up

Po1 up up description SLT-Primary | CCT:84854D

Po2 up up SLT-Backup | CCT:84780D

Po3 down down testing

Po4 up up Uplink | 1.0 Range - Direct

Metro-ASR1001x[1.22]#

Metro-ASR1001x[1.22]#sho interfaces summary

*: interface is up

IHQ: pkts in input hold queue IQD: pkts dropped from input queue

OHQ: pkts in output hold queue OQD: pkts dropped from output queue

RXBS: rx rate (bits/sec) RXPS: rx rate (pkts/sec)

TXBS: tx rate (bits/sec) TXPS: tx rate (pkts/sec)

TRTL: throttle count

Interface IHQ IQD OHQ OQD RXBS RXPS TXBS TXPS TRTL

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

* Te0/0/0 0 0 0 0 168857000 38989 303370000 43847 0

* Te0/0/1 0 0 0 0 137828000 35863 354735000 50295 0

* GigabitEthernet0/0/0 0 0 0 0 740410000 104881 102048000 32885 0

* GigabitEthernet0/0/1 0 0 0 0 0 0 162382000 36417 0

* GigabitEthernet0/0/2 0 0 0 0 7000 8 0 0 0

* GigabitEthernet0/0/3 0 0 0 0 6000 7 0 0 0

* GigabitEthernet0/0/4 0 0 0 0 21000 28 21000 28 0

* GigabitEthernet0/0/5 0 132 0 0 12763000 1807 82439000 10952 0

GigabitEthernet0 0 0 0 0 0 0 0 0 0

* Loopback0 0 0 0 0 0 0 0 0 0

* Loopback2 0 0 0 0 0 0 0 0 0

* Loopback4 0 0 0 0 0 0 0 0 0

* Loopback6 0 0 0 0 0 0 0 0 0

* Port-channel1 0 0 0 0 740410000 104881 264430000 69302 0

* Port-channel2 0 0 0 0 13000 15 0 0 0

Port-channel3 0 0 0 0 0 0 0 0 0

* Port-channel4 0 0 0 0 306685000 74852 658105000 94142 0

Metro-ASR1001x[1.22]#

Metro-ASR1001x[1.22]#sho etherchannel summary

Flags: D - down P/bndl - bundled in port-channel

I - stand-alone s/susp - suspended

H - Hot-standby (LACP only)

R - Layer3 S - Layer2

U - in use f - failed to allocate aggregator

M - not in use, minimum links not met

u - unsuitable for bundling

w - waiting to be aggregated

d - default port

Number of channel-groups in use: 4

Number of aggregators: 4

Group Port-channel Protocol Ports

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

1 Po1(RU) LACP Gi0/0/0(bndl) Gi0/0/1(bndl)

2 Po2(RU) LACP Gi0/0/2(bndl) Gi0/0/3(bndl)

3 Po3(RD)

4 Po4(RU) LACP Te0/0/0(bndl) Te0/0/1(bndl)

RU - L3 port-channel UP State

SU - L2 port-channel UP state

P/bndl - Bundled

S/susp - Suspended

Leo Laohoo · ‎06-01-2022

@mmendis wrote:

there is a problem after configuring the port channel of it

And the problem is what, exactly?

mmendis · ‎06-01-2022

The port channel did now work properly.When the traffic transferring process only one port is work(Gi0/0/0) but the other port(Gi0/0/1) did not get the traffic through it.Please find the following details of the show interfaces summary.

Metro-ASR1001x[1.22]#sho interfaces summary

*: interface is up

IHQ: pkts in input hold queue IQD: pkts dropped from input queue

OHQ: pkts in output hold queue OQD: pkts dropped from output queue

RXBS: rx rate (bits/sec) RXPS: rx rate (pkts/sec)

TXBS: tx rate (bits/sec) TXPS: tx rate (pkts/sec)

TRTL: throttle count

Interface IHQ IQD OHQ OQD RXBS RXPS TXBS TXPS TRTL

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

* Te0/0/0 0 0 0 0 168857000 38989 303370000 43847 0

* Te0/0/1 0 0 0 0 137828000 35863 354735000 50295 0

* GigabitEthernet0/0/0 0 0 0 0 740410000 104881 102048000 32885 0

* GigabitEthernet0/0/1 0 0 0 0 0 0 162382000 36417 0

* GigabitEthernet0/0/2 0 0 0 0 7000 8 0 0 0

MHM Cisco World · ‎06-01-2022

Other side of etherchannel use wrong hash making all traffic flow through one port not load balance between port.

balaji.bandi · ‎06-01-2022

. But there is no Rx traffic from GigabitEthernet0 / 0/1.

how is your Loadbalance configuration done.

I do below steps to verify : when you get chance and maintenance window to test.

1. check the Physical cables if any one having issue.

2. you can shutdown the active link see other traffic able to pass using the other interface.

3. check the load-balance config of etherchannel - show etherchannel load-balance

ASR by default do Flow based, if you looking VLAN based you need to look below config guide :

https://www.cisco.com/c/en/us/td/docs/routers/asr1000/configuration/guide/chassis/asr1000-software-config-guide/evc-port-chann-asr.html

4. post below output

show run interface gi0/0/0

show run interface gi0/0/1

show interface gi0/0/0

show interface gi0/0/1

show run interface po1

BB

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Kasun Bandara · ‎06-01-2022

can be a load balance method misconfiguration. check below guide.

https://www.cisco.com/c/en/us/td/docs/routers/asr1000/configuration/guide/chassis/xe-16-12/asr1000-software-config-guide-16-12/evc-port-chann-asr.html

Please rate this and mark as solution/answer, if this resolved your issue
Good luck
KB

network51 · ‎06-01-2022

What equipment do you have on the other end of this port channel and what is the port channel config on the other end ?