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I think that module supports line-rate for L2 between ports on the same module.
Throughput of the NM slot, itself:
Q. What is the bandwidth for the internal connection between the EtherSwitch service module and the hosting router?
A. Because the module is an NME, the internal connection speed is 1 Gbps. This is seen and configured on both the module and the router as a Gigabit Ethernet interface. The actual performance depends on the specific configuration and the performance of the hosting router.
Q. What is the bandwidth for the backplane connection between the EtherSwitch service module and the hosting router when installed in an Generation 2 ISR using an SM - NM adapter card?
A. Since an NME EtherSwitch Service Module installed in an Integrated Servcies Router Generation 2 needs an adapter card, it will keep the same internal connection characteristics as in the Cisco 2800/3800 series. This means connecting to the host router via an ePCI bus that will provide appr. 1Gbps of throughput to the CPU.
PS:
Also keep in mind the 3845 is rated at 500 Kpps, so it can't guarantee gig perforamance across its gig ports or the NM.
