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Routing extension Light ISIS and OSPF routing extensions for the advertisement of LSR status New Saturation TLV To be carried within the ISIS CAP TLV or the OSPF Router Info LSA A set of bit flags informing about the LSR control plane status Currently one bit defined: S : Saturation A Saturated LSR should set the Saturation bit The Saturation bit must be carefully cleared to avoid the node being saturated again An hysteresis approach could be used to avoid status oscillation Allows head-end LSRs to take appropriate actions Head-End LSRs detecting that an LSR has become saturated should not reroute already established LSP, but should avoid the LSR when computing a new path Head-LSRs detecting that a node is no longer saturated may delay any reoptimization procedure, in order to avoid a signalling storm that may again saturate the node |