Junos® OS Ethernet Interfaces Configuration ... - Juniper Networks

Figure 9: Multicast Topology with Source Connected via MC-Link
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Up and Down Event Handling
Copyright © 2012, Juniper Networks, Inc.
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In Figure 9 on page 97, MCL1 and MCL2 are on different devices and the multicast source
or IGMP querier is connected via MCL2. The data forwarding behavior seen is similar to
that explained for multicast topology with source connected via Layer 3.
NOTE: IGMP snooping should not be configured in proxy mode. There should
be no IGMP hosts or IGMP/PIM routers sitting on the ICL interface.
The following conditions apply to up and down event handling:
1. If the interchassis control protocol (ICCP) connection is UP but the ICL interface
becomes DOWN, the router configured as standby will bring down all the multichassis
aggregated Ethernet interfaces shared with the peer which is connected to ICL. This
will make sure that there are no loops in the network. Otherwise, both PEs will becomes
PIM designated routers and, hence, forward multiple copies of the same packet to
the customer edge.
Chapter 4: Configuring Aggregated Ethernet Interfaces
2. If the ICCP connection is UP and the ICL comes UP, the router configured as standby
will bring up the multichassis aggregated Ethernet interfaces shared with the peer.
3. If both the ICCP connection and the ICL are DOWN, the router configured as standby
will bring up the multichassis aggregated Ethernet interfaces shared with the peer.
4. The layer 2 address learn daemon (l2ald) does not store the information about a MAC
address learned from a peer in the kernel. If l2ald restarts, and if the MAC address was
not learned from the local multichassis aggregated Ethernet interface, l2ald will clear
the MAC addresses and this will cause the router to flood the packets destined to this
MAC address. This behavior is similar to that in a Routing Engine switchover. (Please
note that currently l2ald runs on a Routing Engine only when it is a master). Also,
during the time l2ald is DOWN, ARP packets received from an ICCP peer will be
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