Juniper Junos OS: BGP Session Teardown due to AS_CONFED_SEQUENCE in AS4_PATH (JSA10395)
Description
When sending a BGP UPDATE message, JUNOS may include the following segment types in the AS4_path attribute: * AS_CONFED_SEQUENCE{*} * AS_CONFED_SET{*} This inclusion is in violation of RFC 4893. When the BGP UPDATE message is received by a BGP peer that is capable of processing the AS4_PATH attribute, the receiving peer determines that the AS4_PATH attribute is malformed and clears the BGP session (as is required by Section 6 of RFC 4271). Clearing the BGP session may cause service disruption. This problem is amplified by the transitive, optional nature of the AS4_PATH attribute. When a BGP speaker that cannot process the AS4_PATH attribute receives an UPDATE message containing a malformed AS4_PATH attribute, it may relay that malformed attribute to its BGP peers, causing those BGP sessions to reset.
Solution(s)
- juniper-junos-os-upgrade-latest
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