7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
Configuration Guide
System Management
Edition: 01 3HE 16132 AAAB TQZZA 565
This command allocates route entries for /64-bit IPv6 prefix. Entries in the IPv4 forwarding
table are shared among IPv4 and IPv6 routes. Before adding routes for IPv6 destinations,
route entries in the route lookup table must be allocated for IPv6 addresses using this
command. The remainder of the L3 forwarding table is used for IPv4 routing entries. The
system does not allocate any IPv6 route entries by default for /64-bit prefix, and the user must
allocate some resources before using IPv6.
Each IPv6 /64-bit route requires twice the amount of resources taken up by an IPv4 route.
The number of hardware route entries allocated by the software for IPv6 /64-bit routes is
equal to twice the amount of the value specified using this command.
Note:
• For this command to take effect, reboot the node after making the change.
• On the 7210 SAS-M, 7210 SAS-T, and 7210 SAS-R6 IMMv1, a separate route table is
used for IPv6 /128-bit prefix route lookup. A limited amount of IPv6 /128-bit prefixes is
supported. The software enables lookups in this table by default; no user configuration
is required to enable IPv6 /128-bit route lookup.
• On the 7210 SAS-R6 and 7210 SAS-R12 with IMMv2, 7210 SAS-Sx/S 1/10GE
(standalone and standalone-VC), 7210 SAS-Sx 10/100GE, and 7210 SAS-Mxp, the
IPv6 /128-bit prefixes are allocated by software on boot up. The resources are taken
from the IP FIB shared with IPv4 and IPv6 /64-bit route entries. That is, unlike platforms
like 7210 SAS-M and others, a separate route table is not available in hardware on
these platforms. This affects the scaling of IPv4 routes when IPv6 /64-bit routes are
allocated. See the following bullets for more information.
• On the 7210 SAS-R6 and 7210 SAS-R12 IMMv2 card, 7210 SAS-Sx/S 1/10GE
(standalone and standalone-VC), 7210 SAS-Sx 10/100GE, and 7210 SAS-Mxp, each
IPv6 /128-bit route entry/address prefix requires 4 entries in the IP hardware route
table, each IPv6 /64-bit address prefix requires 2 entries and each IPv4 route entry/
address prefix requires 1 entry.
• The creation of IPv6 IP interfaces without allocating IPv6 route entries is allowed.
However, only IPv6 hosts on the same IPv6 subnet are reachable.
• On the 7210 SAS-R6 and 7210 SAS-R12, the value configured using this command is
used across all IMMs in the chassis.
• The number of available IPv4 route entries in the L3 forwarding table is equal to the
total L3 forwarding entries supported for the platform subtracted by the total number of
entries reserved by this command and the number of entries reserved for IP subnets
using the max-ip-subnets command. See the following bullets for more information.
• On the 7210 SAS-M, 7210 SAS-T, and 7210 SAS-R6 IMMv1 card, the maximum
number of IPv4 prefixes without any IPv6 interfaces configured and IPv6 /64-bit routes
(that is, the max-ipv6-routes command is set to a value of zero) is equal to the
maximum size of the route table supported for the platform. Contact a Nokia
representative to learn more about the routing table scaling limits for each 7210 SAS
platform.
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