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Configuring Mixed Mode
The 7450 mixed mode feature allows a 7450 ESS-7 or ESS-12 chassis to utilize 7750 IOM3-XPs,
MDAs, and IMMs to enable 7750 SR capabilities on the associated slots. This allows features
such as multicast routing, VPRN and IPv6 support as well as others to be enabled on existing 7450
systems.
The following are mixed-mode requirements:
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Notes:
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Enabling Mixed Mode on a 7450 System
To configure mixed mode support, 7750 IOM3-XPs, 7750 MDAs, or 7750 IMMs must be
installed in a 7450 ESS-7 or ESS-12 router that is running OS 8.0 or later. All network interfaces
must be migrated to ports on the 7750 cards.
The mixed mode state is then enabled by using the mixed-mode-upgrade command:
CLI Syntax: mixed-mode-upgrade slot-list
This tool will take a list of slots that should have 7750 cards installed. The command then checks
to ensure that all network interfaces are located on ports on these slots and that they are all 7750
cards. It then enables the mixed-mode state at the system level and changes the capability setting
for the specified slots to sr.
At this point the 7450 system is operating in a mixed mode state and supported features and
services can now be configured on the slots with SR capabilities enabled.
7450 ESS OS Basic System Configuration Guide
SR capabilities (for example, IP-VPNs, IPv6 routing and multicast routing) can only be
associated with interfaces on 7750 IOM3-XPs, MDAs, and IMMs
Network interface ports must be located 7750 IOM3-XPs or IMMs
Only 7750 IOM3-XPs, 7750 MDAs, or 7750 IMMs can be used in 7450 slots with SR
capabilities enabled.
The 7x50 SR supports mixed mode, specifically to run IPv6 services in a router that also
contains IOM-20G-Bs (chassis mode A).
ESM for IPv6 must run on IOM-3 or IMM hardware only, not on IOM or IOM-2, because
the IOM and IOM2 data planes are not capable of routing incoming traffic to the IPv6
ESM hosts.
The scaling limits are still defined by the chassis mode. That means only 16k IPv6 ESM
subscribers (limited by the ARP scale of chassis mode A).
System Management
Page 285
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