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Subscriber Interfaces
System
We recommend the following hold times for each protocol, based on the
number of interfaces.
Recommended Hold Time
Interface Count
for OSPF
16000 or less
80 seconds
16001 to 32000
87 seconds
32001 to 48000
90 seconds
MAC address validation is not supported on either of the following:
Packet-triggered subscriber interfaces that are created dynamically
Packet-triggered subscriber interfaces that are managed on the primary IP
interface
A packet-triggered subscriber interface is created when the router receives a
packet with an IP source address that does not match any entries in the
demultiplexer table. When the router detects an unmatched packet, it
generates a trigger event that determines whether to create a dynamic
subscriber interface or configure an existing interface. To configure packet
detection on the router, use the ip auto-detect ip-subscriber command.
ERX routers display different behavior from E120 routers and E320 routers
when reporting modules as inactive.
ERX routers report a module as inactive when either:
The I/O module is not present
The primary line module is fully booted and ready to resume operation. In
this case, the standby is currently providing services.
E120 routers and E320 routers report a module as inactive when either:
The primary line module has no IOAs.
The primary line module has IOAs, but they have failed diagnostics.
The standby line module has taken over for the primary line module, and
has control of the IOAs.
Because E120 and E320 routers can accommodate up to two IOAs per slot, at
least one IOA must be online. If the second IOA fails, the line module is still
online, but does not use both IOAs. You can ensure that every module is up
and active in the system and not in a failed state by issuing the show version
all command.
Recommended Hold Time
for IS-IS
50 seconds
55 seconds
70 seconds
Known Behavior
Release 10.0.3
33
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