Publication Date: 2013-09-30 | Views: 358 | Downloads: 0 | Author: 00223137 | Document ID: ETC0001085636
Networking:
Multicast source
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NE5000E-1 NE5000E-2
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BRAS
Version: V200R003C02B609
Symptom: Users connected to the BRAS could not request a multicast channel, but could request other multicast channels. Users connected to other BRASs could request this multicast channel.In normal cases, if the Loopback interface of a BRAS connected to an NE5000E was added to a multicast group in static mode, the multicast forwarding table on the NE5000E should contain the outbound interface connected to the BRAS. Information queried on NE5000E-1 was as follows:
<NE5000E-MASTER>display multicast routing-table 239.252.150.10
Multicast routing table of VPN-Instance: public net
Total 775 entries ,33 matched
00001. (58.223.148.6, 239.252.150.10)
Uptime: 6w:1d
Upstream Interface: GigabitEthernet21/1/0
List of 33 downstream interfaces
1: GigabitEthernet11/1/1
.
.
31: GigabitEthernet10/0/1
32: GigabitEthernet17/0/1
33: GigabitEthernet10/0/0
<NE5000E-MASTER>display multicast forwarding-table 239.252.150.10
Multicast Forwarding Table of VPN-Instance: public net
Total 775 entries, 32 matched
00001. (58.223.148.6, 239.252.150.10)
MID: 608, Flags: 0x0:0
Uptime: 6w:1d, Timeout in: 00:03:29
Incoming interface: GigabitEthernet21/1/0
List of 32 outgoing interfaces:
1: GigabitEthernet11/1/1
.
.
30: GigabitEthernet17/0/0
31: GigabitEthernet10/0/1
32: GigabitEthernet10/0/0
Matched 416429493 packets(573363349404 bytes), Wrong If 3694894 packets
Forwarded 412734599 packets(572875622160 bytes)
According to the preceding information, the multicast routing table contained 33 outbound interface, but the multicast forwarding table contained 32 outbound interface. The outbound interface that was missing in the multicast forwarding table was the one connected to the faulty BRAS. Therefore, it could be concluded that this issue was related to multicast forwarding on this NE5000E.The output of the following command indicated that each multicast group in the current NE5000E version supported a maximum of 32 outbound interfaces:
<NE5000E-MASTER>display multicast forwarding-table statistics
775 entries are calculated in statistics
Max 32 OIFs can be supported in each entry
Max 8000 entries can be supported in the tableHuawei viewed information on the other NE5000E and found that the multicast routing table on NE5000E-2 had less than 20 outbound interfaces. This issue could be resolved by performing either of the following operations on the BRAS to move the configuration of the extra outbound interface in the multicast routing table on NE5000E-1 to the multicast forwarding table on NE5000E-2:
1. Add the BRAS interface connected to NE5000E-2 into the multicast group in static mode, and delete the Loopback interface from the multicast group.
2. Add the following static route on the BRAS:
ip rpf-route-static 58.223.157.9 32 GE0/0/2
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Multicast source IP address Interface connected to the NE5000E