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Stateful Line Module Switchover (High Availability)
Copyright © 2010, Juniper Networks, Inc.
You can configure DHCP external server, DHCP local server, DHCP relay, and DHCP
relay proxy on these POS modules in either a virtual router (VR) or a VPN routing and
forwarding instance (VRF).
As part of this feature, the pos keyword has been added to the existing ip dhcp-local
limit command. To specify the maximum number of IP addresses that the DHCP
local server application can supply to all POS access interfaces or to a specific POS
access interface, in the range 0–96000, use the ip dhcp-local limit command with
the new pos keyword. For example:
! Set the IP address limit for all POS access interfaces to 1000
host1(config)#ip dhcp-local limit pos 1000
! Set the IP address limit for the specified POS access interface to 2000
host1(config)#ip dhcp-local limit interface pos 5/0/0 2000
! Restore the IP address limit for all POS access interfaces to the default value, ! 48000
host1(config)#no ip dhcp-local limit pos
To display the maximum number of IP address leases available for POS access
interfaces, use the existing show ip dhcp-local limits command. For example:
host1#show ip dhcp-local limits
*****************************************
DHCP Local Server Address Limits
ATM Limit
- 48000
VLAN Limit
- 48000
POS Limit
- 1000
Ethernet Limit - 48000
Support for Stateful Line Module Switchover on ES2 4G LMs with ES2-ES1 Service
IOA on E120 and E320 Routers
JunosE Software now supports high availability for ES2 4G line modules configured
with Service IOAs on E120 and E320 routers. These line modules function in a 1:1
redundancy mode with the active module as the primary line module and the spare
or standby module as the secondary line module. This functionality of high
availability for line modules is also referred to as stateful line module switchover.
Stateful line module switchover reduces the impact on subscriber traffic during a
stateful switchover from the active line module to the standby line module by
ensuring that existing subscriber sessions remain active with a brief disconnection in
traffic. Stateful line module switchover maintains user sessions and reduces data
forwarding outage to a brief duration through the router during the switchover,
thereby improving the overall availability of the router.
The following commands have been added or modified to support configuration and
monitoring of stateful line module switchover:
line-card switch
mode high-availability slot
show redundancy history line-card
show redundancy line-card
Release 11.3.0
Early Field Trial Features
11
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