Brocade TurboIron 24X Series Configuration Guide - Manual (Page 864)

830 Brocade TurboIron 24X Series Configuration Guide
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Passive multicast route insertion
This command displays the number of warnings and non-zero PIM errors on the device. This count
can increase during transition periods such as reboots and topology changes; however, if the
device is stable, the number of errors should not increase. If warnings keep increasing in a stable
topology, then there may be a configuration error or problems on the device.
To clear the counter for PIM errors, enter the following command.
TurboIron#clear pim counters
clear pim counters
You must configure a fully meshed topology between MSDP peers. This is mandated for this
release beacuse of lack of any EGP that provides a peer RPF check for SA messages that are
forwarded between MSDP peers.
Passive multicast route insertion
Passive Multicast Route Insertion (PMRI) enables a Layer 3 switch running PIM Sparse to create an
entry for a multicast route (e.g., (S,G)), with no directly attached clients or when connected to
another PIM router (transit network).
PMRI is critical for Service Providers wanting to deliver IP-TV services or multicast-based video
services. Service Providers, who have transit networks, distribute multicast-based video services to
other Service Providers, regardless of whether a client subscribes to a video service.
To configure PMRI, enter the following command at the router pim level of the CLI.
TurboIron(config)#router pim
TurboIron#(config-pim-router)#hardware-drop
Syntax: [no] hardware-drop
When you enable PMRI, the show ip pim mcache command output displays the multicast cache
entry along with a drop flag, indicating that the device is dropping packets in hardware. If the HW
flag is set to 1 (HW=1), it implies that the packets are being dropped in hardware. If the HW flag is
set to 0, (HW=0), it indicates that the packets are being processed in software. The following
shows an example display output.
Multicast Source Discovery Protocol (MSDP)
The Multicast Source Discovery Protocol (MSDP) is used by Protocol Independent Multicast (PIM)
Sparse routers to exchange routing information for PIM Sparse multicast groups across PIM Sparse
domains. Routers running MSDP can discover PIM Sparse sources that are in other PIM Sparse
domains.
Devices running software release 04.2.00 and later, you must configure a fully meshed topology
between MSDP peers. This is mandated for this release beacuse of lack of any EGP that provides a
peer RPF check for SA messages that are forwarded between MSDP peers.
TurboIron#show ip pim mcache
1 (10.10.10.18 226.0.1.56) in v10 (e1), cnt=2
Source is directly connected
Sparse Mode, RPT=0 SPT=1 REG=1 MSDP Adv=0 MSDP Create=0
fast=0 slow=0 pru=1 graft age drop
age=0s up-time=2m HW=1 L2-vidx=8191