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Line Module Redundancy
L2TP peer resynchronization enables an L2TP failed endpoint to resynchronize
with its peer non-failed endpoint. The JUNOSe Software supports failover
protocol and silent failover peer resynchronization methods. If you configure
the silent failover method, you must keep the following considerations in mind:
PPP keepalives—To ensure resynchronization of the session database, PPP
keepalives must be enabled on the L2TP data path. Without PPP
keepalives, silent failover might disconnect an established session if there is
no user traffic during failover recovery.
Asymmetric routes on different line modules—Asymmetric routes whose
receive and transmit paths use I/O paths on different line modules can
result in improperly handled line module control packets. If your network
does include this type of asymmetric route, tunnels using these routes
might fail to recover properly.
If you create an L2TP destination profile profileName, establish tunnels with the
profile, and then remove the profile, you cannot subsequently create another
destination profile using that same profileName until all the tunnels drain from
the previous instance of this destination profile. If you do not wait, the E Series
router displays a message similar to the following:
l2tp: Discarding incoming sccrq from vr default, remote address 192.168.100.1 -
no destination profile.
If you do not want to wait for the tunnels to drain, use a different name for the
destination profile. [Defect ID 32973]
On E120 routers and E320 routers, redundant IOAs have a temperature sensor,
and the show environment all command lists the temperature of IOAs in their
associated slots.
On ERX routers, redundant I/O modules do not have a temperature sensor.
Therefore, the show environment all command output lists the primary I/O
module temperature in the slot of the line module that is responsible for the I/O
module.
When you install an ES2-S1 Redundancy IOA with a hardware revision number
of -02 or less in slot 0 or slot 11 of the E320 router or in slot 0 or the E120
router, do not install an OCx/STMx ATM IOA or an OCx/STMx POS IOA in the
lower (E320) or left (E120) adapter bay of slot 1 or slot 12. When the spare line
module is controlling another slot and you revert back to the primary line
module, the ATM or POS IOAs can become unusable or cause the line module to
reset. [Defect ID 69760]
Work-around: This problem is not present for ES2-S1 Redundancy IOAs with a
hardware revision number of -03 or higher.
Release 10.2.2
25
Known Behavior
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