Detections
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1.41 CISC-RT-000600

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Information

The Cisco MPLS switch must be configured to synchronize Interior Gateway Protocol (IGP) and LDP to minimize packet loss when an IGP adjacency is established prior to LDP peers completing label exchange.

GROUP ID: V-221114
RULE ID: SV-221114r999723

Packet loss can occur when an IGP adjacency is established and the switch begins forwarding packets using the new adjacency before the LDP label exchange completes between the peers on that link. Packet loss can also occur if an LDP session closes and the switch continues to forward traffic using the link associated with the LDP peer rather than an alternate pathway with a fully synchronized LDP session. The MPLS LDP-IGP Synchronization feature provides a means to synchronize LDP with OSPF or IS-IS to minimize MPLS packet loss. When an IGP adjacency is established on a link but LDP-IGP synchronization is not yet achieved or is lost, the IGP will advertise the max-metric on that link.

Solution

Configure the MPLS switch to synchronize IGP and LDP, minimizing packet loss when an IGP adjacency is established prior to LDP peers completing label exchange.

OSPF Example

SW1(config)# router ospf 1
SW1(config-switch)# mpls ldp sync

IS-IS Example

SW1(config)# router isis
SW1(config-switch)# mpls ldp sync

See Also

https://workbench.cisecurity.org/benchmarks/22581

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|III, CCI|CCI-000366, CSCv7|13.3, Rule-ID|SV-221114r999723_rule, STIG-ID|CISC-RT-000600, Vuln-ID|V-221114

Plugin: Cisco

Control ID: 7daa318a0c0355e8c155796547d70e17df5f0929696cea229e155043401f4944