Thursday, September 1, 2022

Configure Port Channel Interface and Bidirectional Forwarding Detection (BFD) in a Cisco ASR 1001-X Router

Here's a link in creating a Port-channel interface in a Cisco ASR 1001-X router. You'll need to configure first the Port-channel interface before bundling the individual ports, which is the reverse process in a switch.

ASR1K#configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

ASR1K(config)#interface range GigabitEthernet0/0/1-2

ASR1K(config-if-range)#no shutdown

ASR1K(config-if-range)#channel-group 1 mode active

Channel-group 1 is not configured.

 

% Range command terminated because it failed on GigabitEthernet0/0/1

 

ASR1K(config-if)#do show run interface GigabitEthernet0/0/1

Building configuration...

 

Current configuration : 86 bytes

!

interface GigabitEthernet0/0/1

 no ip address

 no negotiation auto

 cdp enable

 

 

Create the Port-channel interface first. I created a Layer 3 Port-channel in this case.

 

ASR1K(config)#interface Port-channel ?

  <1-64>  Port-channel interface number

 

ASR1K(config-if)# no shutdown

ASR1K(config-if)# ip address 10.1.1.1 255.255.255.252

 

 

ASR1K(config-if)#do sh run int po1

Building configuration...

 

Current configuration : 464 bytes

!

interface Port-channel1

 ip address 10.1.1.1 255.255.255.252

 

 

After the Port-channel interface is configured, you can configure/bundle the individual ports next.

 

ASR1K(config-if)#interface range GigabitEthernet0/0/1-2

ASR1K(config-if-range)#channel-group ?

  <1-64>  Channel group number

 

ASR1K(config-if-range)#channel-group 1 ?

  link  Assign a link identifier used for load-balancing

  mode  Etherchannel Mode of the interface

  <cr>  <cr>

 

ASR1K(config-if-range)#channel-group 1 mode ?

  active   Enable LACP unconditionally

  passive  Enable LACP only if a LACP device is detected

  <cr>     <cr>

 

ASR1K(config-if-range)#channel-group 1 mode active

 

ASR1K(config-if-range)#do sh run int g0/0/1

Building configuration...

 

Current configuration : 122 bytes

!

interface GigabitEthernet0/0/1

 no ip address

 negotiation auto

 cdp enable

 channel-group 1 mode active

 

 

ASR1K(config-if-range)#do sh run int g0/0/2

Building configuration...

 

Current configuration : 122 bytes

!

interface GigabitEthernet0/0/2

 no ip address

 negotiation auto

 cdp enable

 channel-group 1 mode active

 

 

ASR1K#show etherchannel ?

  load-balancing  Load Balance method

  summary         Ether channel summary

 

ASR1K#show 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: 1

Number of aggregators:           1

 

Group  Port-channel  Protocol    Ports

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

1       Po1(RU)         LACP     Gi0/0/4(bndl) Gi0/0/5(bndl)

 

RU - L3 port-channel UP State

SU - L2 port-channel UP state

P/bndl -  Bundled

S/susp  - Suspended

 

Here's a link to configure a Bidirectional Forwarding Detection (BFD) in a Cisco ASR 1001-X. You configure first a BFD template and then apply it to the Port-Channel interface.

ASR1K#configure terminal

ASR1K(config)#bfd?

bfd  bfd-template 

 

ASR1K(config)#bfd ? 

  fast-timers-on-slow-interface  Allow fast timers on slow interfaces

  l2cos                          L2 COS value to be used for BFD packets over VLAN interfaces

  l3cos                          L3 COS value to be used for BFD packets

  map                            configure bfd map entry for multi-hop sessions

  slow-timers                    Change slow timers used by BFD

  snmp                           Provides snmp ralated information that are specific to BFD

 

ASR1K(config)#bfd-template ?

  multi-hop   multi-hop template

  single-hop  Single-hop template

 

ASR1K(config)#bfd-template single-hop ?

  WORD  BFD template name

 

ASR1K(config)#bfd-template single-hop BFD ?      

  <cr>  <cr>

 

ASR1K(config)#bfd-template single-hop BFD

ASR1K(config-bfd)#?

BFD template configuration commands:

  authentication  Authentication type

  dampening       Enable session dampening

  default         Set a command to its defaults

  echo            Use echo adjunct as bfd detection mechanism

  exit            Exit from BFD template configuration mode

  interval        Transmit interval between BFD packets

  no              Negate a command or set its defaults

 

ASR1K(config-bfd)#interval ?

  both          Minimum transmit and receive interval capability

  microseconds  Specify BFD timers in microseconds

  min-tx        Minimum transmit interval capability

 

ASR1K(config-bfd)#interval min-tx ?

  <4-9999>  Milliseconds

 

ASR1K(config-bfd)#interval min-tx 150 ?

  min-rx  Minimum receive interval capability

 

ASR1K(config-bfd)#interval min-tx 150 min-rx ?

  <4-9999>  Milliseconds

 

ASR1K(config-bfd)#interval min-tx 150 min-rx 150 ?

  multiplier  Multiplier value used to compute holddown

  <cr>        <cr>

 

ASR1K(config-bfd)#interval min-tx 150 min-rx 150 multiplier ?

  <3-50>  value used to multiply the interval

 

ASR1K(config-bfd)#interval min-tx 150 min-rx 150 multiplier 3 ?

  <cr>  <cr>

 

ASR1K(config-bfd)#interval min-tx 150 min-rx 150 multiplier 3

 

 

ASR1K(config-if)#interface Port-channel1

ASR1K(config-if)#port-channel ?

  bfd           Enable BFD feature

  load-balance  Configure load-balancing for egress traffic

 

ASR1K(config-if)#port-channel bfd ?

  destination  Destination IP Address

 

ASR1K(config-if)#port-channel bfd destination ?

  ipv4  IPV4 Address

  ipv6  IPV6 address

 

ASR1K(config-if)#port-channel bfd destination ipv4 ?

  A.B.C.D  IP Address

 

ASR1K(config-if)#port-channel bfd destination ipv4 10.1.1.2 ?

  WORD  name of the template

 

ASR1K(config-if)#port-channel bfd destination ipv4 10.1.1.2 BFD ?

  <cr>  <cr>

 

ASR1K(config-if)#port-channel bfd destination ipv4 10.1.1.2 BFD

 

 

ASR1K1(config-if)#do sh run int po1

Building configuration...

 

Current configuration : 518 bytes

!

interface Port-channel1

 ip address 10.1.1.1 255.255.255.252

 port-channel bfd destination ipv4 10.1.1.2 BFD

end


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