AR160 OSPF peer stop at Exchange state through DSVPN and PPPoE

Latest reply: May 25, 2018 17:11:19 392 1 1 0
Issue Description

Customer  set up ospf peer through DSVPN tunnel and PPPoE on AR160, but always stop at exchange state.The peer IP address of tunnel interface can access by ping and there is not packet loss.

c3327da9ec654fe2aa35212f88fede2b

transparent.gif Alarm Information

NA

transparent.gif Handling Process

Checking the state of OSPF peer state and it always stop at exchange state.

[AR160]display ospf peer Tunnel 0/0/0


 OSPF Process 10 with Router ID 10.130.253.166

 Neighbors 


 Area 0.0.0.130 interface 10.130.253.166(Tunnel0/0/0)'s neighbors

 Router ID: 3.2.3.2          Address: 10.130.253.1    

   State: Exchange  Mode:Nbr is  Slave  Priority: 100

   DR: None   BDR: None   MTU: 0    

   Dead timer due in 99  sec 

   Retrans timer interval: 5 

   Neighbor is up for 00:00:00     

   Authentication Sequence: [ 0 ]  

Checking the cumulative of ospf, find out that the AR160 send out DB Description packet but no feedback. Output is increase but input don't change.

[AR160-diagnose]display ospf cumulative 


 OSPF Process 10 with Router ID 10.130.253.166

 Cumulations 


  IO Statistics

             Type        Input     Output

            Hello           90        170

   DB Description           16        295

   Link-State Req            0         13

Link-State Update         1548        142

   Link-State Ack           35        798

  ASE: 98 Checksum Sum: 10465619

  LSAs originated by this router


Ping with big packet, find out the biggest packet can go through is 1350.

[AR160]ping -f -s 1350 10.130.253.1

  PING 10.130.253.1: 1350  data bytes, press CTRL_C to break

    Reply from 10.130.253.1: bytes=1350 Sequence=1 ttl=255 time=12 ms

    Reply from 10.130.253.1: bytes=1350 Sequence=2 ttl=255 time=12 ms

    Reply from 10.130.253.1: bytes=1350 Sequence=3 ttl=255 time=12 ms

    Reply from 10.130.253.1: bytes=1350 Sequence=4 ttl=255 time=12 ms


  --- 10.130.253.1 ping statistics ---

    4 packet(s) transmitted

    4 packet(s) received

    0.00% packet loss

    round-trip min/avg/max = 12/12/12 ms

<AR160>ping -s 1400 10.130.253.2

  PING 10.130.253.2: 1400  data bytes, press CTRL_C to break

    Request time out

    Request time out

    Request time out



  --- 10.130.253.2 ping statistics ---

    3 packet(s) transmitted

    0 packet(s) received

    100.00% packet loss


Checking the MTU of DSVPN tunnel interface and PPPoE interface, both of them is 1500.

<AR161>display  interface tunnel 0/0/0

Tunnel0/0/0 current state : UP

Line protocol current state : UP

Last line protocol up time : 2017-10-23 11:11 UTC+08:00

Description:Connect to MPC, OIS AR1220

Route Port,The Maximum Transmit Unit is 1500

Internet Address is 10.130.253.64/24

Encapsulation is TUNNEL, loopback not set

Tunnel source Dialer1

Tunnel protocol/transport P2MP-GRE/IP, key enabled

Checksumming of packets disabled

Current system time: 2017-10-23 11:11+08:00

    300 seconds input rate 0 bits/sec, 0 packets/sec

    300 seconds output rate 568 bits/sec, 0 packets/sec

    0 seconds input rate 0 bits/sec, 0 packets/sec

    0 seconds output rate 0 bits/sec, 0 packets/sec

    0 packets input,  0 bytes

    0 input error

    123681 packets output,  16021278 bytes

    0 output error

    Input bandwidth utilization  :    0%

    Output bandwidth utilization :    0%

<AR160>display interface Dialer1

Dialer1 current state : UP

Line protocol current state : UP (spoofing)

Description:HUAWEI, AR Series, Dialer1 Interface

Route Port,The Maximum Transmit Unit is 1500, Hold timer is 10(sec)

Internet Address is negotiated, 116.48.155.109/32

Link layer protocol is PPP

LCP initial

Physical is Dialer

Current system time: 2017-10-23 11:11+08:00

    Last 300 seconds input rate 0 bits/sec, 0 packets/sec

    Last 300 seconds output rate 0 bits/sec, 0 packets/sec

    Realtime 0 seconds input rate 0 bits/sec, 0 packets/sec

    Realtime 0 seconds output rate 0 bits/sec, 0 packets/sec

    Input: 0 bytes

    Output:0 bytes

    Input bandwidth utilization  :    0%

    Output bandwidth utilization :    0%

transparent.gif Root Cause

the MTU of DSVPN tunnel interface is too big, cause the OSPF  DB Description packets can’t go through  the PPPoE interface.

transparent.gif Solution

Change the MTU of DSVPN tunnel interface to 1200.

#

interface Tunnel0/0/0

mtu 1200

#

After change the MTU of  tunnel interface, the ospf peer state change to full.

<AR160>dis ospf peer brief


 OSPF Process 10 with Router ID 10.130.253.166

  Peer Statistic Information

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

 Area Id          Interface                        Neighbor id      State    

 0.0.0.130        Tunnel0/0/0                      3.2.3.2          Full        

 0.0.0.130        Tunnel0/0/0                      10.1.11.241      Full        

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

 

transparent.gif Suggestions

If the OSPF peer stop at exchange state, please check whether the MTU of interface is suitable or not.

  • x
  • convention:

Barret Created May 25, 2018 17:11:19 Helpful(0) Helpful(0)

:)
  • x
  • convention:

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