User's Manual
29/OCT/2014 REVIEW DRAFT — CISCO CONFIDENTIAL
5-10
Cisco IR500 Series WPAN Gateway and Range Extender Installation and Configuration Guide
Chapter 5 Operation and Configuration
Information about Raw Socket Transport and MAP-T
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BMR IPv6 prefix and prefix length are used to embed the IPv4 address of nodes inside the
MAP-T domain. For example, a MAP-T domain is configured with a MAP-T IPv6 BMR =
2031:6f8:147e:10::/56. Packets sent or received from IPv4 nodes inside the MAP-T domain
have a translated IPv6 address based on this prefix, i.e. 2031:6f8:147e:10fe:99:a0a:fe00:0 for a
MAP-T IPv4 node set-up with IPv4 153.10.10.254.
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BMR Share ratio: MAP-T being designed for various deployment scenarios, it could be feasible
to allocate to a MAP-T node either an IPv4 prefix (smaller than the MAP-T BMR IPv4 prefix),
or a single IPv4 address (/32) or share a single IPv4 address (/32) between several nodes. In the
later case, it requires indicating how many bits for port numbers are assigned, which is called
“BMR share ratio”. In case of IR 500 deployment, it is recommended to use a single IPv4
address (/32) per IR 500 with a share ratio = 1 to keep the addressing simple.
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BMR Embedded Address (EA) bits indicate – in the case of share ration = 1 – the length of the
IPv4 suffix embedded in the MAP-T IPv6 End-user IPv6 prefix. For example, in case of an IPv4
/24 prefix allocated to a MAP-T domain, the BMR EA value derived from it is 8.
MAP-T Addressing Rules Example
Figure 5-7 is an example of a MAP-T domain, and the domain parameters are provided in Table 5-1. The
Table 5-2 details the translated addresses.
Figure 5-7 MAP-T Domain
CGR 1000
MAP-T Domain
MAP-T
Border Relay
ASR 1000
SCADA
Server
IP WAN
391928
RTUs
WPAN Range
Extender
WPAN
Gateways
The Default Mapping Rule is 2610:D0:1200:CAFE::/64.
Ta b l e 5-1 MAP-T Domain Parameters
MAP-T Domain Parameter Setting
Rule IPv6 Prefix 2031:6F8:147E:1000::
Rule IPv6 Prefix length /56
Rule IPv4 Prefix 153.10.10.0
Rule IPv4 Prefix Length /24
Share Ratio 1
EA bits length 8
Note If EA bits + Rule IPv4 prefix lengths are equal to 32, then a full IPv4 address is to be assigned. The
address is created by concatenating the Rule IPv4 prefix and the EA-bits.