The level of the OSI model

Convergence Time, с

Mechanisms for detecting damage

SDH/SONET

Physical, canal

<5 × 10−6

Triggers the physical layer, APS

SRP (802.17)

Physical, canal

<5 × 10−6

Posts physical layer

Ethernet (STP)

Physical, canal

1 - 2 (802.1 w)

30 - 50 (802.1 d)

BPDU about the network topology changes, producing a timeout BPDU

MPLS-TE

The channel, Net

<10−5

SDH/SONET The alarm message,

Timeouts RSVP-hello packets

IP (IGP)

Net

2 - 5 (for LS)

>10 (for DV)

Timeout service messages