How Can I Identify the Cause When an OSPF Neighbor Relationship Stays in Exstart/Exchange State for a Long Time?

Latest reply: Jul 11, 2018 10:09:38 420 1 0 0

The Exstart/Exchange state indicating that the local switch is exchanging Database Description (DD) packets with a neighbor. If the Exstart/Exchange state lasts for a long time, check the following items:

  • Whether the MTU values on the local interface and neighboring interface are the same.
  • Whether the router IDs on the two devices are the same. The two devices must have different router IDs.
  • Whether the size of received packets exceeds the MTU of the interface. When this occurs, packets sent from the neighbor are dropped.
  • x
  • convention:

liwaye Created Jul 11, 2018 10:09:38 Helpful(0) Helpful(0)

here are a few possibilities may cause OSPF Neighbor Relationship Stays in Exstart/Exchange State for a Long Time
1.same router ID between two device
The unicast connection is broken for the following reasons
1.Error VC/DLCI mapping in frame relay/ATM switch.
2.Access lists prevent unicast
3.The unicast is NAT transformed.
4.The network type between the PRI and the BRI/dial interface is the point-to-point network type.
  • x
  • convention:

Reply

Reply
You need to log in to reply to the post Login | Register

Notice: To protect the legitimate rights and interests of you, the community, and third parties, do not release content that may bring legal risks to all parties, including but are not limited to the following:
  • Politically sensitive content
  • Content concerning pornography, gambling, and drug abuse
  • Content that may disclose or infringe upon others ' commercial secrets, intellectual properties, including trade marks, copyrights, and patents, and personal privacy
Do not share your account and password with others. All operations performed using your account will be regarded as your own actions and all consequences arising therefrom will be borne by you. For details, see " Privacy."
If the attachment button is not available, update the Adobe Flash Player to the latest version!

Login and enjoy all the member benefits

Login
Fast reply Scroll to top