In a R77 ClusterXL Load Sharing configuration, which type of ARP related problem can force the
use of Unicast Mode (Pivot) configuration due to incompatibility on some adjacent routers and
switches?
A.
MGCP MAC address response to a Multicast IP request
B.
Multicast MAC address response to a Unicast IP request
C.
Unicast MAC address response to a Multicast IP request
D.
Multicast MAC address response to a RARP request
C
B.
Multicast MAC is often not allowed as a response by switches/routers as it violates RFC.
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B.
http://dl3.checkpoint.com/paid/7e/7ef174cf00762ceaf228384ea20ea64a/CP_R77_ClusterXL_AdminGuide.pdf?HashKey=1471427794_df3b44c790ee646a3667e92f016a13a0&xtn=.pdf
page 31 – Choose the load sharing mode
Choosing the Load Sharing Mode
Load Sharing Multicast mode is an efficient way to handle a high load because the load is distributed optimally between all cluster members. However, not all routers can be used for Load Sharing Multicast mode. Load Sharing Multicast mode associates a multicast MAC with each unicast cluster IP address. This ensures that traffic destined for the cluster is received by all members. The ARP replies sent by a cluster member will therefore indicate that the cluster IP address is reachable via a multicast MAC address.
Some routing devices will not accept such ARP replies. For some routers, adding a static ARP entry for the cluster IP address on the routing device will solve the issue. Other routers will not accept this type of static ARP entry.
Another consideration is whether your deployment includes routing devices with interfaces operating in promiscuous mode. If on the same network segment there exists two such routers and a ClusterXL gateway in Load Sharing Multicast mode, traffic destined for the cluster that is generated by one of the routers could also be processed by the other router.
For these cases, use Load Sharing Unicast mode, which does not require the use of multicast for the cluster addresses.
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B. Multicast MAC address response to a Unicast IP request
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