Automatic Disabling Of F5 Oam Services; Rate Limiting For F5 Oam Cells; Table 6: Handling Of F4 And F5 Loopback Cells Received - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - LINK LAYER CONFIGURATION GUIDE 2010-10-13 Configuration Manual

Automatic Disabling of F5 OAM Services

Rate Limiting for F5 OAM Cells

Copyright © 2010, Juniper Networks, Inc.

Table 6: Handling of F4 and F5 Loopback Cells Received

Loopback Cell Received
F4 and F5 end-to-end loopback cells and
segment loopback cells with the loopback
location field set to all 1s (ones) and the
loopback indication set.
F4 and F5 segment loopback cells with the
loopback location field set to all 0s (zeros) and
the loopback indication set.
F4 and F5 end-to-end loopback cells and
segment loopback cells with the loopback
location field set to the loopback location ID of
the ATM interface and the loopback indication
set.
F5 end-to-end loopback cells with the loopback
location field set to a value other than all 1s and
the loopback location ID of the ATM interface.
F5 segment loopback cells with the loopback
location field set to other than all 1s (ones), set
to all 0s (zeros), or set to the loopback location
ID of the ATM interface.
The router automatically disables all F5 OAM fault management and VC integrity services
configured on a VC when you change the administrative status of the corresponding ATM
interface, ATM AAL5 interface, or ATM 1483 subinterface from enabled to disabled.
To set the administrative status of an interface to disabled, use the atm shutdown
command (for an ATM interface), the atm aal5 shutdown command (for an ATM AAL5
interface), or the atm atm1483 shutdown command (for an ATM 1483 subinterface).
You can also use the shutdown command to disable the interface.
When F5 OAM is disabled, the OAM VC status field in the show atm vc atm command
display indicates that the VC is not managed. The VC does not receive or transmit F5
OAM cells while F5 OAM is disabled. For examples of the show atm vc atm command
display, see "show atm vc atm" on page 91.
When the corresponding ATM interface, ATM AAL5 interface, or ATM 1483 subinterface
is reenabled, the router automatically restores F5 OAM services on the associated VCs.
The router implements rate limiting for ATM F5 OAM cells to protect the corresponding
ATM interface from denial-of-service (DoS) attacks. The interface discards control
packets when the rate of control packets received exceeds the rate limit for ATM
interfaces.
Chapter 1: Configuring ATM
ATM Interface Response
Clears the loopback indication (sets it to all
zeros) and loops back the received cell.
Resets the loopback indication and the
location ID to all 1s (ones) and loops back the
received cells.
Clears the loopback indication and loops back
the received cell without resetting the location
ID.
Discards the cell.
Discards the cell.
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