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NE80E Does Not Forward the Multicast Packets After Receiving It Because the TTL of the Multicast Server Is Set to 1

Publication Date:  2012-07-27 Views:  42 Downloads:  0
Issue Description
Networking:
GE3/0/23.2 pos2/0/0
Multicast source----SW (T64G)-------------NE80E-1 (RP)----------------T640---------NE80E-2-----ERX (Receiver)
Check the multicast forwarding entries on the NE80E-1 and find that the outgoing interface includes POS 2/0/0, but has not outgoing packets on the POS 2/0/0 and that (S, G) cannot be generated on the T640. 
 
Alarm Information
Null 
Handling Process
The multicast recovers after the TTL is changed by the producer of the multicast server. 
 
Root Cause
Check the forwarding at the lower layer and find that the NE80E-1 discards the multicast packet because the TTL of the multicast packet is 1.
[R2-D-XPF-1-IPTV-diag-ne5000]efu me slot 2 egress display counters all
-----------Rx Debug |Tx Helper |Tx Debug Counter query result : ------------
[ RX_DEBUG_CNT ] :
[ PKT_RX_NUM_PROPER_PKTS_RXED ] = 40728 ( 0x9F18)
[ PKT_RX_BYTE_CNT ] = 54508338 ( 0x33FBB32)
[ PKT_RX_BUF_ALLOC_DEF ] = 40513 ( 0x9E41)
[ TX_Helper_CNT ] :
[ HELPER_RX_CNT ] = 40728 ( 0x9F18)
[ HELPER_TX_CNT ] = 216 ( 0xD8)
[ DROP_IN_CNT ] = 39657 ( 0x9AE9)
[ HELPER_XSCALE_HI_CNT ] = 855 ( 0x357)
[ TX_DEBUG_CNT ] :
PORT 2
[ FRAMES_TXED_CNT ] = 216 ( 0xD8)
------------------------Port Counter query result : --------------------------
------------------------Drop Counter query result : --------------------------
[ IPV4 MULTICAST EGRESS DROP COUNTERS ]:
[ 264 IPV4_MCE_TTL_EXPIRE ] = 39618 ( 0x9AC2 ) //This indicates that 39618 multicast packets are discarded due to the timeout of the TTL.
------------------------Tocp Counter query result :---------------------------
[ EXCP_ID_PPP_CTRL ] = 31 ( 0x1F )
[ EXCP_ID_ISIS ] = 76 ( 0x4C )
[ EXCP_ID_IPV4_RESERVED_MC_IF_ROUTER ] = 36 ( 0x24 )
[ EXCP_ID_IPV4_RESERVED_MC_PIM ] = 8 ( 0x8 )
[ EXCP_ID_IPV4_IGMP ] = 1 ( 0x1 )
[ EXCP_ID_NPMS_XSCALE_HEARTBEAT ] = 154 ( 0x9A )
[ EXCP_ID_NPMS_PST_BROADCAST ] = 465 ( 0x1D1 )
------------------------Dbg Flow Counter query result : ----------------------
[R2-D-XPF-1-IPTV-diag-ne5000] 
 
Suggestions
Null 

END