Service Manual

The range is from 1 to 64.
Viewing an ECMP Group
NOTE: An ecmp-group index is generated automatically for each unique ecmp-group when you congure multipath
routes to the same network. The system can generate a maximum of 512 unique ecmp-groups. The ecmp-group indices
are generated in even numbers (0, 2, 4, 6... 1022) and are for information only.
You can congure ecmp-group with id 2 for link bundle monitoring. This ecmp-group is dierent from the ecmp-group index 2
that is created by conguring routes and is automatically generated. These two ecmp-groups are not related in any way.
Dell(conf-ecmp-group-5)#show config
!
ecmp-group 5
interface tengigabitethernet 1/2/1
interface tengigabitethernet 1/3/1
link-bundle-monitor enable
Dell(conf-ecmp-group-5)#
Support for /128 IPv6 and /32 IPv4 Prexes in Layer 3 Host Table and LPM Table
IPv6 enhancements utilize the capability on S6000 platform to program /128 IPv6 prexes in LPM table and /32 IPv4 prexes in
Host table. Also host table provides ECMP support for destination prexes in the hardware. S6000 platform uses the hardware chip
that supports this behavior and hence they can make use of this capability.
CLI commands are introduced to move /128 IPv6 prex route entries and /32 IPv4 prex route entries from Host table to LPM table
and vice versa. When moving the destination prexes from Route to Host table, there is a possibility of getting into hash collision
because the Host table on the device is a Hash table. In this scenario, a workaround does not exist for the user having route entries
programmed in host table.
When the command is issued, you are prompted with a warning message stating that the command conguration can take eect on
existing prexes only when “clear ip route *” command is used. When you use the clear command, all the existing /32 IPv4 prex
route entries are reprogrammed in appropriate table. Also, all the other existing IPv4 entries are removed and reprogrammed as a
result of the clear command.
Dell Networking OS releases earlier than Release 9.3(0.1) stores IPv6 /128 entries in Host table since it cannot be written in LPM
table, and IPv4 0/32 route entries are written in LPM table itself to support the ECMP since ECMP was not supported in Host table.
On S6000 switches, unied forwarding table (UFT) is enabled, and the host table size is bigger compared to the LPM. When you
move the IPv4 /32 route prex entry in host table, more space is obtained that can be utilized for other route prex entries.
Support for ECMP in host table
ECMP support in the L3 host table is available only on S6000 and S6000–ON platforms. IPv6 /128 prex route entries and IPv4 /32
prex entries which are moved to host table can have ECMP. For other platforms, only the IPv6 /128 prex route entries is stored in
the L3 host table without ECMP support.
The software supports a command to program IPv6 /128 route prexes in the host table.
The output of show IPv6 cam command has been enhanced to include the ECMP eld in the Neighbor table of Ipv6 CAM. The
sample output is displayed as follows, which is similar to the prex table.
The following is the portion of the example output:
Neighbor Mac-Addr Port VId
------------------------------------- ----------------- --------- ----
[ 132] 20::1 00:00:20:d5:ec:a0 Fo 1/4
0
The following is the portion of the example output from Release 9.3(0.1):
Neighbor Mac-Addr Port Vid EC
------------------------------------- -------------------------
[ 132] 20::1 00:00:20:d5:ec:a0 Fo 1/4 0 1
[ 132] 20::1 00:00:20:d5:ec:a1 Fo 1/8 0 1
Equal Cost Multi-Path (ECMP)
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