Advertisement-Interval

Test BGP advertisement-interval functionality. This command sets the minimum time interval between sending BGP routing updates to a specific neighbor. By default, iBGP peers send updates immediately (0 seconds) while eBGP peers wait 30 seconds between updates. This delay helps stabilize the routing table by preventing excessive updates when routes are flapping. Lowering this value can speed up convergence but may increase CPU and bandwidth usage during unstable network conditions.

Test iBGP - Neighbor advertisement-interval low value allows fast updates

Description

Test BGP advertisement-interval with a low value (5 seconds). DUT0 is configured with a short advertisement interval and sends routes to DUT1. With a short interval, new routes should be advertised quickly. After establishing the session and receiving the initial route, a new route is added on DUT0 and should arrive at DUT1 within seconds.

Scenario

Step 1: Set the following configuration in DUT0 :

set interfaces dummy dum0 address 1.1.1.1/24
set interfaces ethernet eth0 address 10.10.0.100/24
set protocols bgp 20 neighbor peer advertisement-interval 5
set protocols bgp 20 neighbor peer remote-address 10.10.0.200
set protocols bgp 20 neighbor peer remote-as 20
set protocols bgp 20 redistribute connected
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 2: Set the following configuration in DUT1 :

set interfaces ethernet eth0 address 10.10.0.200/24
set protocols bgp 20 neighbor peer remote-address 10.10.0.100
set protocols bgp 20 neighbor peer remote-as 20
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Attention

Verify iBGP session establishes between DUT0 and DUT1.

Step 3: Run command protocols bgp show ip summary at DUT0 and check if output matches the following regular expressions:

10.10.0.200.*Established

Attention

Verify that DUT0 has the configured advertisement interval in BGP neighbor info.

Step 4: Run command protocols bgp show ip neighbors neighbor peer at DUT0 and check if output matches the following regular expressions:

Minimum time between advertisement runs is 5 seconds

Show output

BGP neighbor is 10.10.0.200, remote AS 20, local AS 20, internal link
  Local Role: undefined
  Remote Role: undefined
Hostname: osdx
  BGP version 4, remote router ID 10.10.0.200, local router ID 10.10.0.100
  BGP state = Established, up for 00:00:02
  Last read 00:00:01, Last write 00:00:00
  Hold time is 90 seconds, keepalive interval is 30 seconds
  Configured hold time is 90 seconds, keepalive interval is 30 seconds
  Configured tcp-mss is 0, synced tcp-mss is 1448
  Configured conditional advertisements interval is 60 seconds
  Neighbor capabilities:
    4 Byte AS: advertised and received
    AddPath:
      IPv4 Unicast: RX advertised and received
    Paths-Limit:
      IPv4 Unicast: advertised (0) and received (0)
    Long-lived Graceful Restart: advertised and received
      Address families by peer:
    Route refresh: advertised and received
    Enhanced Route Refresh: advertised and received
    Address Family IPv4 Unicast: advertised and received
    Hostname Capability: advertised (name: osdx,domain name: n/a) received (name: osdx,domain name: n/a)
    Version Capability: advertised software version (FRRouting/10.4.1) received software version (FRRouting/10.4.1)
    Link-Local Next Hop Capability: not advertised not received
    Graceful Restart Capability: advertised and received
      Remote Restart timer is 120 seconds
      Address families by peer:
        none
  Graceful restart information:
    End-of-RIB send: IPv4 Unicast
    End-of-RIB received: IPv4 Unicast
    Local GR Mode: Helper*
    Remote GR Mode: Helper
    R bit: True
    N bit: True
    Timers:
      Configured Restart Time(sec): 120
      Received Restart Time(sec): 120
      Configured LLGR Stale Path Time(sec): 0
    IPv4 Unicast:
      F bit: False
      End-of-RIB sent: Yes
      End-of-RIB sent after update: Yes
      End-of-RIB received: Yes
      Timers:
        Configured Stale Path Time(sec): 360
        LLGR Stale Path Time(sec): 0
  Message statistics:
    Inq depth is 0
    Outq depth is 0
                         Sent       Rcvd
    Opens:                  1          1
    Notifications:          0          0
    Updates:                3          1
    Keepalives:             1          1
    Route Refresh:          0          0
    Capability:             0          0
    Total:                  5          3

  Prefix statistics:
    Inbound filtered: 0
    AS-PATH loop: 0
    Originator loop: 0
    Cluster loop: 0
    Invalid next-hop: 0
    Withdrawn: 0
    Attributes discarded: 0

  Minimum time between advertisement runs is 5 seconds

 For address family: IPv4 Unicast
  Update group 1, subgroup 1
  Packet Queue length 0
  Community attribute sent to this neighbor(all)
  0 accepted, 2 sent prefixes

  Connections established 1; dropped 0
  Last reset never
  Internal BGP neighbor may be up to 255 hops away.
Local host: 10.10.0.100, Local port: 179
Foreign host: 10.10.0.200, Foreign port: 56908
Nexthop: 10.10.0.100
Nexthop global: fe80::dcad:beff:feef:6c00
Nexthop local: fe80::dcad:beff:feef:6c00
BGP connection: shared network
BGP Connect Retry Timer in Seconds: 30
Estimated round trip time: 0 ms
Read thread: on  Write thread: on  FD used: 25

Attention

Verify DUT1 receives initial route 1.1.1.0/24 from DUT0.

Step 5: Run command protocols bgp show ip at DUT1 and check if output matches the following regular expressions:

1.1.1.0/24

Note

Add a new route on DUT0 and verify it arrives quickly at DUT1.

Step 6: Modify the following configuration lines in DUT0 :

set interfaces dummy dum1 address 2.2.2.1/24

Attention

Verify DUT1 receives the new route 2.2.2.0/24 within a short time.

Step 7: Run command protocols bgp show ip at DUT1 and check if output matches the following regular expressions:

2.2.2.0/24

Test iBGP - Neighbor advertisement-interval high value delays updates

Description

Test BGP advertisement-interval with a high value (600 seconds). DUT0 is configured with a long advertisement interval and sends routes to DUT1. With a long interval, new routes are delayed before being advertised. After establishing the session and receiving the initial route, a new route is added on DUT0 but should NOT arrive at DUT1 immediately because DUT0 waits for the interval.

Scenario

Step 1: Set the following configuration in DUT0 :

set interfaces dummy dum0 address 1.1.1.1/24
set interfaces ethernet eth0 address 10.10.0.100/24
set protocols bgp 20 neighbor peer advertisement-interval 600
set protocols bgp 20 neighbor peer remote-address 10.10.0.200
set protocols bgp 20 neighbor peer remote-as 20
set protocols bgp 20 redistribute connected
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 2: Set the following configuration in DUT1 :

set interfaces ethernet eth0 address 10.10.0.200/24
set protocols bgp 20 neighbor peer remote-address 10.10.0.100
set protocols bgp 20 neighbor peer remote-as 20
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Attention

Verify iBGP session establishes between DUT0 and DUT1.

Step 3: Run command protocols bgp show ip summary at DUT0 and check if output matches the following regular expressions:

10.10.0.200.*Established

Attention

Verify that DUT0 has the configured advertisement interval in BGP neighbor info.

Step 4: Run command protocols bgp show ip neighbors neighbor peer at DUT0 and check if output matches the following regular expressions:

Minimum time between advertisement runs is 600 seconds

Show output

BGP neighbor is 10.10.0.200, remote AS 20, local AS 20, internal link
  Local Role: undefined
  Remote Role: undefined
Hostname: osdx
  BGP version 4, remote router ID 10.10.0.200, local router ID 10.10.0.100
  BGP state = Established, up for 00:00:01
  Last read 00:00:00, Last write 00:00:00
  Hold time is 90 seconds, keepalive interval is 30 seconds
  Configured hold time is 90 seconds, keepalive interval is 30 seconds
  Configured tcp-mss is 0, synced tcp-mss is 1448
  Configured conditional advertisements interval is 60 seconds
  Neighbor capabilities:
    4 Byte AS: advertised and received
    AddPath:
      IPv4 Unicast: RX advertised and received
    Paths-Limit:
      IPv4 Unicast: advertised (0) and received (0)
    Long-lived Graceful Restart: advertised and received
      Address families by peer:
    Route refresh: advertised and received
    Enhanced Route Refresh: advertised and received
    Address Family IPv4 Unicast: advertised and received
    Hostname Capability: advertised (name: osdx,domain name: n/a) received (name: osdx,domain name: n/a)
    Version Capability: advertised software version (FRRouting/10.4.1) received software version (FRRouting/10.4.1)
    Link-Local Next Hop Capability: not advertised not received
    Graceful Restart Capability: advertised and received
      Remote Restart timer is 120 seconds
      Address families by peer:
        none
  Graceful restart information:
    End-of-RIB send: IPv4 Unicast
    End-of-RIB received: IPv4 Unicast
    Local GR Mode: Helper*
    Remote GR Mode: Helper
    R bit: True
    N bit: True
    Timers:
      Configured Restart Time(sec): 120
      Received Restart Time(sec): 120
      Configured LLGR Stale Path Time(sec): 0
    IPv4 Unicast:
      F bit: False
      End-of-RIB sent: Yes
      End-of-RIB sent after update: Yes
      End-of-RIB received: Yes
      Timers:
        Configured Stale Path Time(sec): 360
        LLGR Stale Path Time(sec): 0
  Message statistics:
    Inq depth is 0
    Outq depth is 0
                         Sent       Rcvd
    Opens:                  1          1
    Notifications:          0          0
    Updates:                3          1
    Keepalives:             1          1
    Route Refresh:          0          0
    Capability:             0          0
    Total:                  5          3

  Prefix statistics:
    Inbound filtered: 0
    AS-PATH loop: 0
    Originator loop: 0
    Cluster loop: 0
    Invalid next-hop: 0
    Withdrawn: 0
    Attributes discarded: 0

  Minimum time between advertisement runs is 600 seconds

 For address family: IPv4 Unicast
  Update group 1, subgroup 1
  Packet Queue length 0
  Community attribute sent to this neighbor(all)
  0 accepted, 2 sent prefixes

  Connections established 1; dropped 0
  Last reset never
  Internal BGP neighbor may be up to 255 hops away.
Local host: 10.10.0.100, Local port: 179
Foreign host: 10.10.0.200, Foreign port: 45508
Nexthop: 10.10.0.100
Nexthop global: fe80::dcad:beff:feef:6c00
Nexthop local: fe80::dcad:beff:feef:6c00
BGP connection: shared network
BGP Connect Retry Timer in Seconds: 30
Estimated round trip time: 0 ms
Read thread: on  Write thread: on  FD used: 25

Attention

Verify DUT1 receives initial route 1.1.1.0/24 from DUT0.

Step 5: Run command protocols bgp show ip at DUT1 and check if output matches the following regular expressions:

1.1.1.0/24

Note

Add a new route on DUT0.

Step 6: Modify the following configuration lines in DUT0 :

set interfaces dummy dum1 address 2.2.2.1/24

Attention

Wait a short time and verify DUT1 does NOT have the new route yet due to high interval.

Step 7: Run command protocols bgp show ip at DUT1 and check if output does not match the following regular expressions:

2.2.2.0/24