====================================================================== Output for show commands: ====================================================================== ip12-75a# ip12-75a# ip12-75a#show ip pgm router interface Address Interface 10.1.0.2 Ethernet1/0/0 10.3.0.2 Ethernet1/0/4 10.4.0.2 Ethernet1/0/5 10.2.0.2 Serial5/0 ---------------------------------------------------------------------- ip12-75a#show ip pgm r state verbose TSI Group Neighbour TGSIZE 0A0700C85555-1000 227.7.7.7 rpf/source N/A 00:04:25 0A0700C85555-2000 227.7.7.7 rpf/source 16 00:04:27 The second sessions with a TGSIZE of 16 is a session supporting parity. Also the timer associated with each session (00:04:..) is an idle timer, the session state is deleted when this timer expires. ip12-75a#show ip pgm router state verbose TSI Group Neighbour TGSIZE 0A0700C85555-1000 227.7.7.7 rpf/source N/A 00:04:55 sqn 1990 age 4 ELIM TMR Ethernet1/0/0 sqn 1991 age 5 (anticipated) 0A0700C85555-2000 227.7.7.7 rpf/source 16 00:04:55 sqn ( 125, 7) age 10 Serial5/0 prty # 7 State after NAKs have been received for each of these sessions. For the first TSI: The first is a selective NAK for sqn 1990 and was received on Ethernet1/0/0. The ELIM TMR indicates that the state is currently eliminating and any NAKs received will not be forwarded. The second is for a selective NCF for sqn 1991, this is anticipated state, ie. was created by a NCF for a NAK sent by some other router with the same PGM upstream nbr as us. For the second TSI: This is a parity NAK for 7 packets of the Transmission Group 124. This was received on Serial5/0, #7 indicates that 7 parity packets must be forwarded out this interface. ---------------------------------------------------------------------- ip12-75a#show ip pgm router traffic Ethernet1/0/0 NAKs received 2 eliminated 1 (1 0 nomrte 0 noprty 0 err) NCFs transmitted 2 (2 cpy 0 err) RDATA forwarded 1 SPMs forwarded 41 Ethernet1/0/4 Ethernet1/0/5 NAKs forwarded 4 (4 dir 0 dlr) NCFs received 5 (4 1 ant 0 nul 0 rdir 0 rpf 0 pprty 0 noprty 0 err) RDATA received 9 eliminated 1 (0 qck 1 oif) SPMs received 41 used 41 (41 src 0 nbr 0 rpf) Serial5/0 NAKs received 4 eliminated 1 (1 0 nomrte 0 noprty 0 err) NCFs transmitted 4 (4 cpy 0 err) RDATA forwarded 7 SPMs forwarded 41 ====================================================================== Output for PGM debug messages ====================================================================== 1. SPMs PGM: Received SPM on Ethernet1/0/5 from 10.7.0.200 to 227.7.7.7 (52 bytes) SPM TSI 0A0700C85555-1000 data-dport 1001 csum CCCC tlen 52 dsqn 3758096779 tsqn 1954 isqn 1979 lsqn 1990 NLA 10.7.0.200 SPM from source/RPF-neighbour 10.7.0.200 for 10.7.0.200 (SPT) Forwarded SPM from 10.7.0.200 to 227.7.7.7 Debug message for a selective SPM. PGM: Received SPM on Ethernet1/0/5 from 10.7.0.200 to 227.7.7.7 (52 bytes) SPM TSI 0A0700C85555-2000 data-dport 2001 csum CCCC tlen 52 Options P N O dsqn 3758096768 tsqn 1986 isqn 1994 lsqn 2006 NLA 10.7.0.200 SPM from source/RPF-neighbour 10.7.0.200 for 10.7.0.200 (SPT) Forwarded SPM from 10.7.0.200 to 227.7.7.7 Debug for a parity SPM. The 'P N O' flags indicate what options are present in this packet. 'O' indicates options are present, 'N' indicates options are network significant and 'P' indicates that this is a parity packet. 2. NAKs and NCFs PGM: Received NAK on Ethernet1/0/0 from 10.1.0.4 to 10.1.0.2 (36 bytes) NAK TSI 0A0700C85555-1000 data-dport 1001 csum CCCC tlen 36 dsqn 1990 data source 10.7.0.200 group 227.7.7.7 NAK unicast routed to RPF neighbour 10.4.0.1 Forwarding NAK from 10.1.0.4 to 10.4.0.1 for 10.7.0.200 PGM: Received NCF on Ethernet1/0/5 from 10.7.0.200 to 227.7.7.7 (36 bytes) NCF TSI 0A0700C85555-1000 data-dport 1001 csum CACC tlen 36 dsqn 1990 data source 10.7.0.200 group 227.7.7.7 NAK retx canceled for TSI 0A0700C85555-1000 dsqn 1990 NAK elimination started for TSI 0A0700C85555-1000 dsqn 1990 PGM: Received NCF on Ethernet1/0/5 from 10.7.0.200 to 227.7.7.7 (36 bytes) NCF TSI 0A0700C85555-1000 data-dport 1001 csum CACC tlen 36 dsqn 1991 data source 10.7.0.200 group 227.7.7.7 No NAK retx outstanding for TSI 0A0700C85555-1000 dsqn 1991 NAK anticipated for TSI 0A0700C85555-1000 dsqn 1991 Debug messages for a received NAK which is forwarded and the NCF received from the upstream nbr. 3. RDATA PGM: Received RDATA on Ethernet1/0/5 from 10.7.0.200 to 227.7.7.7 (70 bytes) RDATA TSI 0A0700C85555-1000 data-dport 1001 csum CCCC tlen 32 tsqn 1954 dsqn 1990 Marking Ethernet1/0/0 for forwarding Marking Serial5/0 for skipping Forwarded RDATA from 10.7.0.200 to 227.7.7.7 Debug message for RDATA packet corresponding to a NAK for sqn 1990. Since the NAK was received on Ethernet1/0/0, RDATA is forwarded out only that interface and another interface in the multicast olist Serial5/0 is skipped. PGM: Received RDATA on Ethernet1/0/5 from 10.7.0.200 to 227.7.7.7 (70 bytes) RDATA TSI 0A0700C85555-1000 data-dport 1001 csum CCCC tlen 32 tsqn 1954 dsqn 1991 Eliminated RDATA (null oif) from 10.7.0.200 to 227.7.7.7 Debug message for an RDATA packet for which we have only anticipated state, sqn 1991. Since we didn't actually get a NAK this RDATA is not forwarded by the PGM router. .