Routing

Hello Guys

Has anyone had issue with getting micro BFD to work between a Juniper MX960 and a EX4300. Please see config below. The weird part is that on the MX, the state is stuck in "innit" while the switch remains down. Am not sure if this is a hardwars issue or a circuit fault.

MX960

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set interfaces ae12 aggregated-ether-options bfd-liveness-detection minimum-interval 10
set interfaces ae12 aggregated-ether-options bfd-liveness-detection neighbor 10.0.17.33
set interfaces ae12 aggregated-ether-options bfd-liveness-detection local-address 192.168.183.6
set interfaces ae12 aggregated-ether-options lacp active
set interfaces ae12 aggregated-ether-options lacp periodic fast

OUTPUT:

# run show bfd session address 10.0.17.33 extensive
Detect Transmit
Address State Interface Time Interval Multiplier
10.0.17.33 Init ge-0/2/1 3.000 1.000 3
Client LACPD, TX interval 0.010, RX interval 0.010
Local diagnostic NbrSignal, remote diagnostic None
Remote state Down, version 1
Replicated
Session type: Micro BFD
Min async interval 0.010, min slow interval 1.000
Adaptive async TX interval 0.010, RX interval 0.010
Local min TX interval 1.000, minimum RX interval 0.010, multiplier 3
Remote min TX interval 1.000, min RX interval 0.010, multiplier 3
Local discriminator 309, remote discriminator 132
Echo mode disabled/inactive, no-absorb, no-refresh
Remote is control-plane independent
Session ID: 0x0

1 sessions, 1 clients
Cumulative transmit rate 1.0 pps, cumulative receive rate 1.0 pps

{master}[edit]

EX4300

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set interfaces ae1 flexible-vlan-tagging
set interfaces ae1 aggregated-ether-options bfd-liveness-detection minimum-interval 10
set interfaces ae1 aggregated-ether-options bfd-liveness-detection neighbor 192.168.183.6
set interfaces ae1 aggregated-ether-options bfd-liveness-detection local-address 10.0.17.33
set interfaces ae1 aggregated-ether-options lacp passive

OUTPUT:

#run show bfd session extensive
Detect Transmit
Address State Interface Time Interval Multiplier
192.168.183.6 Down ge-0/0/45 0.000 1.000 3
Client LACPD, TX interval 0.010, RX interval 0.010
Local diagnostic None, remote diagnostic None
Remote state AdminDown, version 1
Replicated
Session type: Micro BFD
Min async interval 0.010, min slow interval 1.000
Adaptive async TX interval 0.010, RX interval 0.010
Local min TX interval 1.000, minimum RX interval 0.010, multiplier 3
Remote min TX interval 0.000, min RX interval 0.000, multiplier 0
Local discriminator 132, remote discriminator 0
Echo mode disabled/inactive, no-absorb, no-refresh
Session ID: 0x0

1 sessions, 1 clients
Cumulative transmit rate 1.0 pps, cumulative receive rate 0.0 pps

Hello,

Possible issues to look for:

1/ uBFD has to use source IP address from lo0.0 -  apart from very recent JUNOS where LAG IP is possible to use as src.IP for uBFD

2/ udp/6784 has to be permitted in lo0.0 filter

HTH

Thx

Alex

Yes I checked this. there is no firewall filter on the EX switch.

EX4300

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show configuration interfaces lo0 | display set
set interfaces lo0 unit 0 family inet address 10.0.17.33/32 primary

MX960

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show configuration interfaces lo0 | display set
set interfaces lo0 unit 0 family inet address 192.168.183.6/32 primary

set groups protect-box firewall family inet filter accept-bfd term accept-bfd from source-prefix-list protect-box-router-ipv4
set groups protect-box firewall family inet filter accept-bfd term accept-bfd from source-prefix-list protect-box-router-ipv4-logical-systems
set groups protect-box firewall family inet filter accept-bfd term accept-bfd from source-prefix-list protect-box-loopback
set groups protect-box firewall family inet filter accept-bfd term accept-bfd from source-prefix-list protect-box-bfd-micro-neighbors
set groups protect-box firewall family inet filter accept-bfd term accept-bfd from destination-prefix-list protect-box-router-ipv4
set groups protect-box firewall family inet filter accept-bfd term accept-bfd from destination-prefix-list protect-box-router-ipv4-logical-systems
set groups protect-box firewall family inet filter accept-bfd term accept-bfd from destination-prefix-list protect-box-loopback
set groups protect-box firewall family inet filter accept-bfd term accept-bfd from destination-prefix-list protect-box-bfd-micro-neighbors
set groups protect-box firewall family inet filter accept-bfd term accept-bfd from protocol udp
set groups protect-box firewall family inet filter accept-bfd term accept-bfd from source-port 49152-65535
set groups protect-box firewall family inet filter accept-bfd term accept-bfd from destination-port 3784-3785
set groups protect-box firewall family inet filter accept-bfd term accept-bfd from destination-port 6784
set groups protect-box firewall family inet filter accept-bfd term accept-bfd then count accept-bfd
set groups protect-box firewall family inet filter accept-bfd term accept-bfd then accept

Hi, Do you see if your LAG interfaces UP with current config?

What are the Junos in both devices ?

//Regards

Dwivedi

Hi kchange1010,

Remote state is "AdminDown" on EX.  This is independent Micro BFD on LAG, don't see that supported on EX4300 yet:

https://apps.juniper.net/feature-explorer/feature-info.html?fKey=6175&fn=BFD%20over%20child%20links%20of%20AE%20or%20LAG%20bundle

About the feature:

https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/bfd-protocol-configuring-micro-bfd-for-lag.html

Please double check with TAC for support and mark/update the post.

Hope this helps.

Regards,
-r.

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