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Hitless-supported services and protocols

(Continued)

TABLE 18

Traffic type Supported protocols

and services

Impact

controller will re-

authenticate 802.1X or

MDPA sessions that were

being forwarded in

hardware. The hardware

continues to forward them

(even with dynamic VLAN)

while re-authentication

occurs. After trying to re-

authenticate for a certain

amount of time

(depending on the number

of sessions to re-

authorize), sessions that

did not re-authenticate are

removed.

Other

services to

Management

• AAA

• DHCP

• sFlow

• SNMP v1, v2, and

• SNMP traps

• SNTP

• Traceroute

Supported protocols and

services are not impacted

during a switchover or

failover.

DNS lookups will continue

after a switchover or

failover. This information

is not synchronized.

Ping traffic will be

minimally impacted.

NOTE

If the FCX stack is

rebooted, sFlow is

disabled on standby and

member units until the

configuration is

synchronized between the

active and standby

controllers.

Hitless stacking configuration notes and feature limitations

• For hitless stacking on the FCX, Brocade recommends that you configure the traditional stack MAC

address using the stack mac command. Without this configuration, the MAC address of the stack

will change to the new base MAC address of the active controller. This could cause a spanning tree

root change. Even without a spanning tree change, a client (for example, a personal computer)

pinging the stack might encounter a long delay depending on the client MAC aging time. The client

will not work until it ages out the old MAC address and sends ARP requests to relearn the new

stack MAC address. Refer to Manually allocating the traditional stack MAC address on page 50.

• Layer 3 multicast traffic is supported by hitless stacking.

Hitless stacking configuration notes and feature limitations

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