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Example: Configuring Independent Micro BFD Sessions for LAG
This example shows how to configure an independent micro BFD session for aggregated Ethernet interfaces.
Requirements
This example uses the following hardware and software components:
MX Series routers with Junos Trio chipset
T Series routers with Type 4 FPC or Type 5 FPC
BFD for LAG is supported on the following PIC types on T-Series:
PC-1XGE-XENPAK (Type 3 FPC),
PD-4XGE-XFP (Type 4 FPC),
PD-5-10XGE-SFPP (Type 4 FPC),
24x10GE (LAN/WAN) SFPP, 12x10GE (LAN/WAN) SFPP, 1X100GE Type 5 PICs
PTX Series routers with 24X10GE (LAN/WAN) SFPP
Junos OS Release 13.3 or later running on all devices
Overview
The example includes two routers that are directly connected. Configure two aggregated Ethernet interfaces, AE0 for IPv4 connectivity and AE1 for IPv6 connectivity. Configure micro BFD session on the AE0 bundle using IPv4 addresses as local and neighbor endpoints on both routers. Configure micro BFD session on the AE1 bundle using IPv6 addresses as local and neighbor endpoints on both routers. This example verifies that independent micro BFD sessions are active in the output.
Topology
Figure 1 shows the sample topology.
Configuration
- CLI Quick Configuration
- Configuring a Micro BFD Session for Aggregated Ethernet Interfaces
- Procedure
- Results
CLI Quick Configuration
To quickly configure this example, copy the following commands, paste them into a text file, remove any line breaks, change any details necessary to match your network configuration, and then copy and paste the commands into the CLI at the [edit] hierarchy level.
Router R0
set interfaces ge-1/0/1 unit 0 family inet address 20.20.20.1/30 set interfaces ge-1/0/1 unit 0 family inet6 address 3ffe::1:1/126 set interfaces xe-4/0/0 gigether-options 802.3ad ae0 set interfaces xe-4/0/1 gigether-options 802.3ad ae0 set interfaces xe-4/1/0 gigether-options 802.3ad ae1 set interfaces xe-4/1/1 gigether-options 802.3ad ae1 set interfaces lo0 unit 0 family inet address 10.255.106.107/32 set interfaces lo0 unit 0 family inet6 address 201:DB8:251::aa:aa:1/126 set interfaces ae0 aggregated-ether-options bfd-liveness-detection minimum-interval 100 set interfaces ae0 aggregated-ether-options bfd-liveness-detection neighbor 10.255.106.102 set interfaces ae0 aggregated-ether-options bfd-liveness-detection local-address 10.255.106.107 set interfaces ae0 aggregated-ether-options minimum-links 1 set interfaces ae0 aggregated-ether-options link-speed 10g set interfaces ae0 aggregated-ether-options lacp active set interfaces ae0 unit 0 family inet address 10.0.0.1/30 set interfaces ae1 aggregated-ether-options bfd-liveness-detection minimum-interval 100 set interfaces ae1 aggregated-ether-options bfd-liveness-detection multiplier 3 set interfaces ae1 aggregated-ether-options bfd-liveness-detection neighbor 201:DB8:251::bb:bb:1 set interfaces ae1 aggregated-ether-options bfd-liveness-detection local-address 201:DB8:251::aa:aa:1 set interfaces ae1 aggregated-ether-options minimum-links 1 set interfaces ae1 aggregated-ether-options link-speed 10g set interfaces ae1 aggregated-ether-options lacp active set interfaces ae1 unit 0 family inet6 address 5555::1/126 set interface ae1 unit 0 family inet6 dad-disable set routing-options nonstop-routing set routing-options static route 30.30.30.0/30 next-hop 10.0.0.2 set routing-options rib inet6.0 static route 3ffe::1:2/126 next-hop 5555::2 set protocols bfd traceoptions file bfd set protocols bfd traceoptions file size 100m set protocols bfd traceoptions file files 10 set protocols bfd traceoptions flag all
Router R1
set interfaces ge-1/1/8 unit 0 family inet address 30.30.30.1/30 set interfaces ge-1/1/8 unit 0 family inet6 address 3ffe::1:2/126 set interfaces xe-0/0/0 gigether-options 802.3ad ae0 set interfaces xe-0/0/1 gigether-options 802.3ad ae0 set interfaces xe-0/0/2 gigether-options 802.3ad ae1 set interfaces xe-0/0/3 gigether-options 802.3ad ae1 set interfaces lo0 unit 0 family inet address 10.255.106.102/32 set interfaces lo0 unit 0 family inet6 address 201:DB8:251::bb:bb:1/126 set interfaces ae0 aggregated-ether-options bfd-liveness-detection minimum-interval 150 set interfaces ae0 aggregated-ether-options bfd-liveness-detection multiplier 3 set interfaces ae0 aggregated-ether-options bfd-liveness-detection neighbor 10.255.106.107 set interfaces ae0 aggregated-ether-options bfd-liveness-detection local-address 10.255.106.102 set interfaces ae0 aggregated-ether-options minimum-links 1 set interfaces ae0 aggregated-ether-options link-speed 10g set interfaces ae0 aggregated-ether-options lacp passive set interfaces ae0 unit 0 family inet address 10.0.0.2/30 set interfaces ae1 aggregated-ether-options bfd-liveness-detection minimum-interval 200 set interfaces ae1 aggregated-ether-options bfd-liveness-detection multiplier 3 set interfaces ae1 aggregated-ether-options bfd-liveness-detection neighbor 201:DB8:251::aa:aa:1 set interfaces ae1 aggregated-ether-options bfd-liveness-detection local-address 201:DB8:251::bb:bb:1 set interfaces ae1 aggregated-ether-options minimum-links 1 set interfaces ae1 aggregated-ether-options link-speed 10g set interfaces ae1 aggregated-ether-options lacp passive set interfaces ae1 unit 0 family inet6 address 5555::2/126 set routing-options static route 20.20.20.0/30 next-hop 10.0.0.1 set routing-options rib inet6.0 static route 3ffe::1:1/126 next-hop 5555::1
Configuring a Micro BFD Session for Aggregated Ethernet Interfaces
Procedure
Step-by-Step Procedure
The following example requires that you navigate various levels in the configuration hierarchy. For information about navigating the CLI, see “Using the CLI Editor in Configuration Mode” in the CLI User Guide.
Repeat this procedure for Router R1, modifying the appropriate interface names, addresses, and any other parameters for each router.
To configure a micro BFD session for aggregated Ethernet interfaces on Router R0:
Configure the physical interfaces.
[edit interfaces] user@R0# set ge-1/0/1 unit 0 family inet address 20.20.20.1/30 user@R0# set ge-1/0/1 unit 0 family inet6 address 3ffe::1:1/126 user@R0# set xe-4/0/0 gigether-options 802.3ad ae0 user@R0# set xe-4/0/1 gigether-options 802.3ad ae0 user@R0# set xe-4/1/0 gigether-options 802.3ad ae1 user@R0# set xe-4/1/1 gigether-options 802.3ad ae1
Configure the loopback interface.
[edit interfaces] user@R0# set lo0 unit 0 family inet address 10.255.106.107/32 user@R0# set lo0 unit 0 family inet6 address 201:DB8:251::aa:aa:1/128
Configure an IP address on the aggregated Ethernet interface ae0 with either IPv4 or IPv6 addresses, as per your network requirements.
[edit interfaces] user@R0# set ae0 unit 0 family inet address 10.0.0.1/30
Set the routing option, create a static route, and set the next-hop address.
Note:You can configure either an IPv4 or IPv6 static route, depending on your network requirements.
[edit routing-options] user@R0# set nonstop-routing user@R0# set static route 30.30.30.0/30 next-hop 10.0.0.2 user@R0# set rib inet6.0 static route 3ffe::1:2/126 next-hop 5555::2
Configure the Link Aggregation Control Protocol (LACP).
[edit interfaces] user@R0# set ae0 aggregated-ether-options lacp active
Configure BFD for the aggregated Ethernet interface ae0, and specify the minimum interval, local IP address, and the neighbor IP address.
[edit interfaces] user@R0# set ae0 aggregated-ether-options bfd-liveness-detection minimum-interval 100 user@R0# set ae0 aggregated-ether-options bfd-liveness-detection multiplier 3 user@R0# set ae0 aggregated-ether-options bfd-liveness-detection neighbor 10.255.106.102 user@R0# set ae0 aggregated-ether-options bfd-liveness-detection local-address 10.255.106.107 user@R0# set ae0 aggregated-ether-options minimum-links 1 user@R0# set ae0 aggregated-ether-options link-speed 10g
Configure an IP addresse on the aggregated Ethernet interface ae1.
You can assign either IPv4 or IPv6 addresses as per your network requirements.
[edit interfaces] user@R0# set ae1 unit 0 family inet6 address 5555::1/126
Configure BFD for the aggregated Ethernet interface ae1.
[edit interfaces] user@R0# set ae1 aggregated-ether-options bfd-liveness-detection minimum-interval 100 user@R0# set ae1 aggregated-ether-options bfd-liveness-detection multiplier 3 user@R0# set ae1 aggregated-ether-options bfd-liveness-detection neighbor 201:DB8:251::bb:bb:1 user@R0# set ae1 aggregated-ether-options bfd-liveness-detection local-address 201:DB8:251::aa:aa:1 user@R0# set ae1 aggregated-ether-options minimum-links 1 user@R0# set ae1 aggregated-ether-options link-speed 10g
Note:Beginning with Junos OS Release 16.1, you can also configure this feature with the AE interface address as the local address in a micro BFD session.
Beginning with Release 16.1R2, Junos OS checks and validates the configured micro BFD
local-addressagainst the interface or loopback IP address before the configuration commit. Junos OS performs this check on both IPv4 and IPv6 micro BFD address configurations, and if they do not match, the commit fails.Configure tracing options for BFD for troubleshooting.
[edit protocols] user@R0# set bfd traceoptions file bfd user@R0# set bfd traceoptions file size 100m user@R0# set bfd traceoptions file files 10 user@R0# set bfd traceoptions flag all
Results
From configuration mode, enter the show interfaces, show protocols, and show routing-options commands and confirm your configuration. If the output does not display the intended configuration, repeat the instructions in this example to correct the configuration.
user@R0> show interfaces
traceoptions {
flag bfd-events;
}
ge-1/0/1 {
unit 0 {
family inet {
address 20.20.20.1/30;
}
family inet6 {
address 3ffe::1:1/126;
}
}
}
xe-4/0/0 {
enable;
gigether-options {
802.3ad ae0;
}
}
xe-4/0/1 {
gigether-options {
802.3ad ae0;
}
}
xe-4/1/0 {
enable;
gigether-options {
802.3ad ae1;
}
}
xe-4/1/1 {
gigether-options {
802.3ad ae1;
}
}
lo0 {
unit 0 {
family inet {
address 10.255.106.107/32;
}
family inet6 {
address 201:DB8:251::aa:aa:1/128;
}
}
}
ae0 {
aggregated-ether-options {
bfd-liveness-detection {
minimum-interval 100;
neighbor 10.255.106.102;
local-address 10.255.106.107;
}
minimum-links 1;
link-speed 10g;
lacp {
active;
}
}
unit 0 {
family inet {
address 10.0.0.1/30;
}
}
}
ae1 {
aggregated-ether-options {
bfd-liveness-detection {
minimum-interval 100;
multiplier 3;
neighbor 201:DB8:251::bb:bb:1;
local-address 201:DB8:251::aa:aa:1;
}
minimum-links 1
link-speed 10g;
}
unit 0 {
family inet6 {
address 5555::1/126;
}
}
}
user@R0> show protocols
bfd {
traceoptions {
file bfd size 100m files 10;
flag all;
}
}
user@R0> show routing-options
nonstop-routing ;
rib inet6.0 {
static {
route 3ffe:1:2/126 {
next-hop 5555::2;
}
}
}
static {
route 30.30.30.0/30 {
next-hop 10.0.0.2;
}
}
If you are done configuring the device, commit the configuration.
user@R0# commit
Verification
Confirm that the configuration is working properly.
Verifying That the Independent BFD Sessions Are Up
Purpose
Verify that the micro BFD sessions are up, and view details about the BFD sessions.
Action
From operational mode, enter the show bfd session
extensive command.
user@R0> show bfd session extensive
Detect Transmit
Address State Interface Time Interval Multiplier
10.255.106.102 Up xe-4/0/0 9.000 3.000 3
Client LACPD, TX interval 0.100, RX interval 0.100
Session up time 4d 23:13, previous down time 00:00:06
Local diagnostic None, remote diagnostic None
Remote heard, hears us, version 1
Replicated
Session type: Micro BFD
Min async interval 0.100, min slow interval 1.000
Adaptive async TX interval 0.100, RX interval 0.100
Local min TX interval 0.100, minimum RX interval 0.100, multiplier 3
Remote min TX interval 3.000, min RX interval 3.000, multiplier 3
Local discriminator 21, remote discriminator 75
Echo mode disabled/inactive
Remote is control-plane independent
Session ID: 0x0
Detect Transmit
Address State Interface Time Interval Multiplier
10.255.106.102 Up xe-4/0/1 9.000 3.000 3
Client LACPD, TX interval 0.100, RX interval 0.100
Session up time 4d 23:13, previous down time 00:00:07
Local diagnostic None, remote diagnostic None
Remote heard, hears us, version 1
Replicated
Session type: Micro BFD
Min async interval 0.100, min slow interval 1.000
Adaptive async TX interval 0.100, RX interval 0.100
Local min TX interval 0.100, minimum RX interval 0.100, multiplier 3
Remote min TX interval 3.000, min RX interval 3.000, multiplier 3
Local discriminator 19, remote discriminator 74
Echo mode disabled/inactive
Remote is control-plane independent
Session ID: 0x0
Detect Transmit
Address State Interface Time Interval Multiplier
201:DB8:251::bb:bb:1 Up xe-4/1/1 9.000 3.000 3
Client LACPD, TX interval 0.100, RX interval 0.100
Session up time 4d 23:13
Local diagnostic None, remote diagnostic None
Remote not heard, hears us, version 1
Replicated
Session type: Micro BFD
Min async interval 0.100, min slow interval 1.000
Adaptive async TX interval 0.100, RX interval 0.100
Local min TX interval 1.000, minimum RX interval 0.100, multiplier 3
Remote min TX interval 3.000, min RX interval 3.000, multiplier 3
Local discriminator 17, remote discriminator 67
Echo mode disabled/inactive, no-absorb, no-refresh
Remote is control-plane independent
Session ID: 0x0
Detect Transmit
Address State Interface Time Interval Multiplier
201:DB8:251::bb:bb:1 UP xe-4/1/0 9.000 3.000 3
Client LACPD, TX interval 0.100, RX interval 0.100
Session up time 4d 23:13
Local diagnostic None, remote diagnostic None
Remote not heard, hears us, version 1
Replicated
Session type: Micro BFD
Min async interval 0.100, min slow interval 1.000
Adaptive async TX interval 0.100, RX interval 0.100
Local min TX interval 1.000, minimum RX interval 0.100, multiplier 3
Remote min TX interval 3.000, min RX interval 3.000, multiplier 3
Local discriminator 16, remote discriminator 66
Echo mode disabled/inactive, no-absorb, no-refresh
Remote is control-plane independent
Session ID: 0x0
4 sessions, 4 clients
Cumulative transmit rate 2.0 pps, cumulative receive rate 1.7 pps
Meaning
The Micro BFD field represents the independent micro
BFD sessions running on the links in a LAG. The TX interval item, RX interval item output represents
the setting configured with the minimum-interval statement.
All of the other output represents the default settings for BFD. To
modify the default settings, include the optional statements under bfd-liveness-detection statement.
Viewing Detailed BFD Events
Purpose
View the contents of the BFD trace file to assist in troubleshooting, if required.
Action
From operational mode, enter the file show /var/log/bfd command.
user@R0> file show /var/log/bfd Jun 5 00:48:59 Protocol (1) len 1: BFD Jun 5 00:48:59 Data (9) len 41: (hex) 42 46 44 20 6e 65 69 67 68 62 6f 72 20 31 30 2e 30 2e 30 Jun 5 00:48:59 PPM Trace: BFD neighbor 10.255.106.102 (IFL 349) set, 9 0 Jun 5 00:48:59 Received Downstream RcvPkt (19) len 108: Jun 5 00:48:59 IfIndex (3) len 4: 329 Jun 5 00:48:59 Protocol (1) len 1: BFD Jun 5 00:48:59 SrcAddr (5) len 8: 10.255.106.102 Jun 5 00:48:59 Data (9) len 24: (hex) 00 88 03 18 00 00 00 4b 00 00 00 15 00 2d c6 c0 00 2d c6 Jun 5 00:48:59 PktError (26) len 4: 0 Jun 5 00:48:59 RtblIdx (24) len 4: 0 Jun 5 00:48:59 MultiHop (64) len 1: (hex) 00 Jun 5 00:48:59 Unknown (168) len 1: (hex) 01 Jun 5 00:48:59 Unknown (171) len 2: (hex) 02 3d Jun 5 00:48:59 Unknown (172) len 6: (hex) 80 71 1f c7 81 c0 Jun 5 00:48:59 Authenticated (121) len 1: (hex) 01 Jun 5 00:48:59 BFD packet from 10.0.0.2 (IFL 329), len 24 Jun 5 00:48:59 Ver 0, diag 0, mult 3, len 24 Jun 5 00:48:59 Flags: IHU Fate Jun 5 00:48:59 My discr 0x0000004b, your discr 0x00000015 Jun 5 00:48:59 Tx ivl 3000000, rx ivl 3000000, echo rx ivl 0 Jun 5 00:48:59 [THROTTLE]bfdd_rate_limit_can_accept_pkt: session 10.255.106.102 is up or already in program thread Jun 5 00:48:59 Replicate: marked session (discr 21) for update
Meaning
BFD messages are being written to the specified trace file.