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What Is BGP TTL Security

Publication Date:  2018-10-09 Views:  87 Downloads:  0
Issue Description
An EBGP peer relationship is established between a Cisco device and a Huawei device using loopback interface addresses. After the link is disconnected unexpectedly, flapping occurs on the EBGP peer that should be in the Down state. Therefore, Cisco uses the neighbor ip-address ttl-security hops 1 command to resolve this problem. Huawei needs to modify the configuration accordingly.
Alarm Information
After the link is interrupted unexpectedly, flapping occurs on the EBGP peer that should be in the Down state.
Handling Process
1. Check related documentation and found that Huawei has the peer valid-ttl-hops command to apply GTSM on a BGP peer or peer group.

2. GTSM takes effect only when the peer valid-ttl-hops command is run on both ends of the BGP connection. In addition, you must disable EBGP-MAX-HOP because it is mutually exclusive with GSTM.

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