Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 444
Configuring the Flex Hash Mechanism, LACP Fast Switchover
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Configuring the Flex Hash Mechanism The flex hash functionality enables you to configure a packet search key and matches packets based on the search key. When a packet matches the search key, two 16-bit hash fields are extracted from the start of the L4 header and provided as inputs (bins 2 and 3) for RTAG7 hash computation. You must specify the offset of hash fields from the start of the L4 header, which contains a flow identification field. 1 You can enable bins 2 and 3 by using the load-balance ingress-port enable command in Global Configuration mode. To configure the flex hash functionality, you must enable these bins. CONFIGURATION mode Dell(conf)# load-balance ingress-port enable When load balancing RRoCE packets using flex hash is enabled, the show ip flow command is disabled. Similarly, when the show ip flow command is in use (ingress port-based load balancing is disabled), the hashing of RRoCE packets is disabled. Flex hash APIs do not mask out unwanted byte values after extraction of the data from the Layer 4 headers for the offset value. 2 Use the load-balance flexhash command to specify whether IPv4 or IPv6 packets must be subjected to the flex hash functionality, a unique protocol number, the offset of hash fields from the start of the L4 header to be used for hash calculation, and a meaningful description to associate the protocol number with the name. CONFIGURATION mode Dell(conf)# load-balance flexhash ipv4/ipv6 ip-proto offset1 [offset2 ] To delete the configured flex hash setting, use the no version of the command. LACP Fast Switchover LACP Fast Switchover causes the physical ports to be aggregated faster when configured in a port-channel on both the nodes that are members of a port-channel. When LACP 'fast-switchover' is enabled on the system, two optimizations are performed to the LACP behavior: • The wait-while timer is not started in the 'waiting' state of the MUX state machine. The port moves directly to the 'attached' state. • The local system moves to the 'collecting' and 'distributing' states on the port in a single step without waiting for the partner to set the 'collecting' bit. Flex Hash and Optimized Boot-Up 444
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1,187
-
1,188
-
1,189
-
1,190
-
1,191
-
1,192
-
1,193
-
1,194
-
1,195
-
1,196
-
1,197
-
1,198
-
1,199
-
1,200
-
1,201
-
1,202
-
1,203
-
1,204
-
1,205
-
1,206
-
1,207
-
1,208
-
1,209
-
1,210
-
1,211
-
1,212
-
1,213
-
1,214
-
1,215
-
1,216
-
1,217
-
1,218
-
1,219
-
1,220
-
1,221
-
1,222
-
1,223
-
1,224
-
1,225
-
1,226
-
1,227
-
1,228
-
1,229
-
1,230
-
1,231
-
1,232
-
1,233
-
1,234
-
1,235
-
1,236
-
1,237
-
1,238
-
1,239
-
1,240
-
1,241
-
1,242
-
1,243
-
1,244
-
1,245
-
1,246
-
1,247
-
1,248
-
1,249
-
1,250
-
1,251