Name: Cisco CRS
Brand: Cisco
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This figure illustrates the IS-IS overload bit scenario:

Figure 21: IS-IS overload bit

Consider a MPLS TE topology in which usage of nodes that indicated an overload situation was restricted.

In this topology, the router R7 exhibits overload situation and hence this node can not be used during TE

CSPF. To overcome this limitation, the IS-IS overload bit avoidance (OLA) feature was introduced. This

feature allows network administrators to prevent RSVP-TE label switched paths (LSPs) from being disabled

when a router in that path has its Intermediate System-to-Intermediate System (IS-IS) overload bit set.

The IS-IS overload bit avoidance feature is activated at router R1 using this command:

mpls traffic-eng path-selection ignore overload

configure

mpls traffic-eng

path-selection ignore overload

commit

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General

Operating System	Cisco IOS XR
Product Type	Core Router
Form Factor	Modular Chassis
Dimensions	Varies by chassis type
Weight	Varies by chassis type
Architecture	Distributed
Switch Fabric	Multi-stage
Interface Support	Ethernet, SONET/SDH, OTN
Interfaces/Ports	Varies by line card
Port Density	Varies by line card
Routing Protocol	BGP, IS-IS, OSPF, MPLS
Management	CLI, SNMP
Power Supply	Redundant, hot-swappable
Cooling	Redundant, Hot-swappable Fan Trays
Supported Protocols	IPv4, IPv6, MPLS
Management Interfaces	Ethernet, console
Security Features	ACLs