Configurazione e risoluzione dei problemi di riflessione del servizio multicast su Catalyst 8000
Introduzione
In questo documento viene descritto il processo per la risoluzione dei problemi relativi alla funzionalità Multicast Service Reflection di Catalyst 8000.
Prerequisiti
Requisiti
Cisco raccomanda la conoscenza dei seguenti argomenti:
- Conoscenza del routing multicast di base
- Conoscenza della riga di comando di Cisco IOS® XE
Componenti usati
Le informazioni fornite in questo documento si basano sulle seguenti versioni software e hardware:
- Router Catalyst 8500
- Cisco IOS XE 17.9.4
Le informazioni discusse in questo documento fanno riferimento a dispositivi usati in uno specifico ambiente di emulazione. Su tutti i dispositivi menzionati nel documento la configurazione è stata ripristinata ai valori predefiniti. Se la rete è operativa, valutare attentamente eventuali conseguenze derivanti dall'uso dei comandi.
Premesse
Lo scopo di questo documento è dimostrare la configurazione di base e la risoluzione dei problemi della funzionalità Multicast Service Reflection per convalidare uno scenario di traduzione da multicast a multicast con un Cisco Catalyst 8000.
Multicast Service Reflection è una funzione versatile che può essere implementata in vari punti di una rete per soddisfare requisiti multicast specifici. Consente di migliorare l'efficienza e l'affidabilità dei servizi multicast in ambienti di rete complessi in quanto consente agli utenti di convertire gli indirizzi di destinazione multicast o unicast ricevuti in indirizzi multicast o unicast conformi ai criteri di indirizzamento interni.
Multicast Service Reflection consente di tradurre entrambi origine e gli indirizzi di destinazione in l'intestazione IPv4. Identifica i flussi di traffico multicast (associati a gruppi e origini multicast specifici) che devono essere tradotti (in base alla configurazione predefinita) e, quando il traffico raggiunge il punto di riflessione, il router che esegue la traduzione riflette in modo selettivo questi pacchetti.
Uno dei componenti principali di questa funzionalità è l'interfaccia virtuale (Vif). Questa interfaccia Vif è un'interfaccia logica che può essere aggiunta in modo statico al gruppo e deve essere riflessa in per compilare la struttura multicast. In altre parole, questa interfaccia Vif agisce come ricevitore multicast per del flusso originale e una volta inoltrato il traffico all'interfaccia Vif, i pacchetti vengono riflessi e gli indirizzi di origine/destinazione vengono convertiti nei nuovi indirizzi IPv4 desiderati.
Nota: per implementare questa funzione, il router deve avere installato almeno una licenza network-benefits, altrimenti si verificherà un errore durante il tentativo di configurare l'interfaccia VIF.
Topologia
Diagramma topologico
Configurazione
Per configurare la funzione in questa configurazione, è necessario abilitare il routing multicast sul percorso e abilitare anche la connettività IPv4 di base tra l'origine multicast e il ricevitore. In questo scenario, sono presenti uno switch Catalyst 9K (C9000) che funge da router per il primo hop (FHR), il router Catalyst 8K (C8000) che funge da multicast Service Reflector e anche il punto di rendering (RP) per i diversi gruppi multicast e un router ASR1K (ASR1000) che funge da router per l'ultimo hop (LHR) a cui è connesso il ricevitore. Nell'esempio, il protocollo eBGP (External Border Gateway Protocol) viene usato per interconnettere i dispositivi, ma non è necessario implementare un particolare protocollo di routing.
Nota: in questo esempio viene utilizzato un solo RP per i vari flussi multicast. Per ulteriori informazioni sugli scenari in cui vengono utilizzati RP diversi per i domini multicast, vedere la sezione Configuration Examples for Multicast Service Reflection della IP Multicast Configuration Guide, Cisco IOS XE 17.x
FHR (C9000)
Per avviare la configurazione in FHR, abilitare il routing multicast, aggiungere l'indirizzo IPv4 RP e configurare il PIM-SM (Protocol Independent Multicast Sparse Mode) sulle interfacce connesse all'origine multicast e al router Multicast Service Reflector (C800).
C9000#show run | i multicast|rp-address ip multicast-routing class-map match-any system-cpp-police-multicast-end-station class-map match-any system-cpp-police-multicast ip pim rp-address 10.100.100.1
C9000#show run interface Ten 1/0/6 Building configuration... Current configuration : 116 bytes ! interface TenGigabitEthernet1/0/6 no switchport ip address 192.168.0.1 255.255.255.252 ip pim sparse-mode end C9000#show run interface Ten 1/0/3 Building configuration... Current configuration : 116 bytes ! interface TenGigabitEthernet1/0/3 no switchport ip address 192.168.0.5 255.255.255.252 ip pim sparse-mode endLo switch C9000 sta effettuando un'operazione eBGP in prossimità del router C8000 per pubblicizzare le route connesse.
C9000#show run | section router bgp
router bgp 65003
bgp log-neighbor-changes
redistribute connected
neighbor 192.168.0.6 remote-as 65001Multicast Service Reflector Router (C800)
Sul router Catalyst 8K, per la configurazione iniziale e abilitare il routing multicast, aggiungere l'indirizzo IPv4 RP appropriato e configurare il protocollo PIM-SM sulle interfacce connesse ai dispositivi C9000 e ASR1000 e sull'interfaccia Loopback0.
Mcast_SR#show run | i multicast|rp-address ip multicast-routing distributed ip pim rp-address 10.100.100.1
Mcast_SR#show run interface Ten 0/0/2 Building configuration... Current configuration : 156 bytes ! interface TenGigabitEthernet0/0/2 description to C9000 ip address 192.168.0.6 255.255.255.252 ip pim sparse-mode no negotiation auto cdp enable end Mcast_SR#show run interface Ten 0/0/5 Building configuration... Current configuration : 157 bytes ! interface TenGigabitEthernet0/0/5 description to ASR1000 ip address 172.16.0.1 255.255.255.252 ip pim sparse-mode no negotiation auto cdp enable endMcast_SR#show run interface loopback 0 Building configuration... Current configuration : 88 bytes ! interface Loopback0 ip address 10.100.100.1 255.255.255.255 ip pim sparse-mode end
Questo router ha due router adiacenti eBGP, il router adiacente 192.168.0.5 è lo switch C9000 che invia i prefissi per raggiungere l'origine multicast e il secondo router adiacente è il router ASR1000 usato per raggiungere il ricevitore. Il router annuncia il loopback0 locale e la subnet Vif.
Mcast_SR#show run | section router bgp router bgp 65001 bgp log-neighbor-changes network 10.100.100.1 mask 255.255.255.255 network 172.16.101.0 mask 255.255.255.252 neighbor 172.16.0.2 remote-as 65002 neighbor 192.168.0.5 remote-as 65003
A questo punto, è necessario configurare l'interfaccia Vif, che permette di convertire il gruppo multicast da 239.5.5.5 a 239.55.55.55. Questa interfaccia logica deve avere un indirizzo IP e questa subnet deve essere instradabile. Inoltre, è necessario configurare PIM-SM. Per abilitare la funzionalità Riflessione servizio multicast, il comando ip service reflection <id_interfaccia> destination <ip1> to <ip2_destinazione> mask-line <lunghezza_subnet_mask> source <ip_origine> viene utilizzato, dove id_interfaccia è l'interfaccia che riceve il traffico multicast originale, ip1_destinazione è l'indirizzo IPv4 originale da tradurre (239.5.5.5) e ip2_destinazione è il nuovo indirizzo IPv4 previsto dopo la traduzione (239.5 5.55.55). Infine, ma non per questo meno importante, il comando ip igmp static-group <indirizzo-gruppo>è necessario per rendere questa interfaccia un membro connesso in modo statico del gruppo multicast originale.
Mcast_SR#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Mcast_SR(config)#interface Vif1
Mcast_SR(config-if)#ip address 172.16.101.1 255.255.255.252
Mcast_SR(config-if)#ip pim sparse-mode
Mcast_SR(config-if)#ip service reflect TenGigabitEthernet0/0/2 destination 239.5.5.5 to 239.55.55.55 mask-len 32 source 172.16.101.2
Mcast_SR(config-if)#ip igmp static-group 239.5.5.5
Mcast_SR(config-if)#endNota: l'interfaccia "Vif1" è strettamente associata al VRF (Virtual Route Forwarding) predefinito per la funzionalità Riflessione servizio multicast. Se si seleziona un numero diverso per questa interfaccia, nella console sarà possibile visualizzare un messaggio simile a "Only Vif1 can be used for Service Reflect in global table" (Solo Vif1 può essere utilizzato per il riflesso servizio nella tabella globale).
L'output successivo mostra l'interfaccia Vif dopo l'applicazione della configurazione. Notare che l'operazione sull'interfaccia diventa UP/UP e la funzione di output è SERVICE REFLECT con l'aiuto del comando show ip interface<interface>:
Mcast_SR#show run interface Vif1 Building configuration... Current configuration : 229 bytes ! interface Vif1 ip address 172.16.101.1 255.255.255.252 ip pim sparse-mode ip service reflect TenGigabitEthernet0/0/2 destination 239.5.5.5 to 239.55.55.55 mask-len 32 source 172.16.101.2 ip igmp static-group 239.5.5.5 endMcast_SR#show ip interface vif1 Vif1 is up, line protocol is up Internet address is 172.16.101.1/30 Broadcast address is 255.255.255.255 Address determined by non-volatile memory MTU is 1514 bytes Helper address is not set Directed broadcast forwarding is disabled Multicast reserved groups joined: 224.0.0.1 224.0.0.2 224.0.0.22 224.0.0.13 Outgoing Common access list is not set Outgoing access list is not set Inbound Common access list is not set Inbound access list is not set Proxy ARP is enabled Local Proxy ARP is disabled Security level is default Split horizon is enabled ICMP redirects are always sent ICMP unreachables are always sent ICMP mask replies are never sent IP fast switching is enabled IP Flow switching is disabled IP CEF switching is enabled IP CEF switching turbo vector IP Null turbo vector Associated unicast routing topologies: Topology "base", operation state is UP Associated multicast routing topologies: Topology "base", operation state is UP IP multicast fast switching is enabled IP multicast distributed fast switching is disabled IP route-cache flags are Fast, CEF Router Discovery is disabled IP output packet accounting is disabled IP access violation accounting is disabled TCP/IP header compression is disabled RTP/IP header compression is disabled Probe proxy name replies are disabled Policy routing is disabled Network address translation is disabled BGP Policy Mapping is disabled Input features: MCI Check Output features: SERVICE REFLECT IPv4 WCCP Redirect outbound is disabled IPv4 WCCP Redirect inbound is disabled IPv4 WCCP Redirect exclude is disabled IP Clear Dont Fragment is disabled
LHR (ASR1000)
Per la configurazione in LHR, allo stesso modo, abilitare il routing multicast e il PIM-SM sulle interfacce connesse al router Multicast Service Reflector e verso il ricevitore e inoltre assicurarsi di configurare l'indirizzo IPv4 RP:
ASR1000#show run | i multicast|rp-address ip multicast-routing distributed ip pim rp-address 10.100.100.1
ASR1000#show run interface Ten 0/1/1 Building configuration... Current configuration : 133 bytes ! interface TenGigabitEthernet0/1/1 ip address 172.16.0.2 255.255.255.252 ip pim sparse-mode no negotiation auto cdp enable end ASR1000#show run interface GigabitEthernet0/0/0 Building configuration... Current configuration : 127 bytes ! interface GigabitEthernet0/0/0 ip address 172.16.0.5 255.255.255.252 ip pim sparse-mode negotiation auto cdp enable end
Per la connettività IP, questo router sta anche utilizzando BGP per scambiare i prefissi connessi:
ASR1000#show run | section router bgp
router bgp 65002
bgp log-neighbor-changes
redistribute connected
neighbor 172.16.0.1 remote-as 65001Verifica iniziale
Come verifica iniziale, è possibile iniziare a controllare la connettività IP di base, lo scambio di route tra i dispositivi e lo stato PIM. L'output successivo è stato preso dal Catalyst 9K e mostra le route installate verso il ricevitore (172.16.0.6), RP Loopback0 (10.100.100.1) e Vif (172.16.101.1). Si può anche notare che esiste un'adiacenza PIM con il router C8000 e che la mappatura RP punta anche all'indirizzo 10.100.100.1.
C9000#show ip route 172.16.0.6 Routing entry for 172.16.0.4/30 Known via "bgp 65003", distance 20, metric 0 Tag 65001, type external Last update from 192.168.0.6 2d22h ago Routing Descriptor Blocks: * 192.168.0.6, from 192.168.0.6, 2d22h ago opaque_ptr 0x7FD797D4BA18 Route metric is 0, traffic share count is 1 AS Hops 2 Route tag 65001 MPLS label: none C9000#ping 172.16.0.6 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.0.6, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms C9000#show ip route 10.100.100.1 Routing entry for 10.100.100.1/32 Known via "bgp 65003", distance 20, metric 0 Tag 65001, type external Last update from 192.168.0.6 2d22h ago Routing Descriptor Blocks: * 192.168.0.6, from 192.168.0.6, 2d22h ago opaque_ptr 0x7FD797D4B8D8 Route metric is 0, traffic share count is 1 AS Hops 1 Route tag 65001 MPLS label: none C9000#ping 10.100.100.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 10.100.100.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms C9000#show ip route 172.16.101.1 Routing entry for 172.16.101.0/30 Known via "bgp 65003", distance 20, metric 0 Tag 65001, type external Last update from 192.168.0.6 2d00h ago Routing Descriptor Blocks: * 192.168.0.6, from 192.168.0.6, 2d00h ago opaque_ptr 0x7FD797D4B8D8 Route metric is 0, traffic share count is 1 AS Hops 1 Route tag 65001 MPLS label: none C9000#ping 172.16.101.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.101.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms C9000#show ip pim neighbor PIM Neighbor Table Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority, P - Proxy Capable, S - State Refresh Capable, G - GenID Capable, L - DR Load-balancing Capable Neighbor Interface Uptime/Expires Ver DR Address Prio/Mode 192.168.0.6 TenGigabitEthernet1/0/3 2d22h/00:01:29 v2 1 / DR S P G C9000#show ip pim interface Address Interface Ver/ Nbr Query DR DR Mode Count Intvl Prior 192.168.0.5 TenGigabitEthernet1/0/3 v2/S 1 30 1 192.168.0.6 192.168.0.1 TenGigabitEthernet1/0/6 v2/S 0 30 1 192.168.0.1C9000#show ip pim rp mapping PIM Group-to-RP Mappings Group(s): 224.0.0.0/4, Static RP: 10.100.100.1 (?)
Multicast Service Reflector mostra entrambi gli indirizzi 172.16.101.1 (Vif) e 10.100.100.1 (Loopback0) come connessi direttamente e le route all'origine e al destinatario apprese tramite BGP:
Mcast_SR#show ip route 10.100.100.1 Routing entry for 10.100.100.1/32 Known via "connected", distance 0, metric 0 (connected, via interface) Advertised by bgp 65001 Routing Descriptor Blocks: * directly connected, via Loopback0 Route metric is 0, traffic share count is 1
Mcast_SR#show ip route 172.16.101.1 Routing entry for 172.16.101.1/32 Known via "connected", distance 0, metric 0 (connected) Routing Descriptor Blocks: * directly connected, via Vif1 Route metric is 0, traffic share count is 1Mcast_SR#show ip route 172.16.0.6 Routing entry for 172.16.0.4/30 Known via "bgp 65001", distance 20, metric 0 Tag 65002, type external Last update from 172.16.0.2 5d20h ago Routing Descriptor Blocks: * 172.16.0.2, from 172.16.0.2, 5d20h ago opaque_ptr 0x7F841CBD53D0 Route metric is 0, traffic share count is 1 AS Hops 1 Route tag 65002 MPLS label: none
Mcast_SR#show ip route 192.168.0.2 Routing entry for 192.168.0.0/30 Known via "bgp 65001", distance 20, metric 0 Tag 65003, type external Last update from 192.168.0.5 5d20h ago Routing Descriptor Blocks: * 192.168.0.5, from 192.168.0.5, 5d20h ago opaque_ptr 0x7F841CBD5290 Route metric is 0, traffic share count is 1 AS Hops 1 Route tag 65003 MPLS label: none
Il router C8000 mostra anche due vicini PIM con quattro interfacce abilitate con PIM-SM (incluse Vif e Loopback0), viene visualizzata la corretta mappatura RP e con il comando show ip multicast è possibile verificare le funzionalità Multicast Service Reflect del dispositivo:
Mcast_SR#show ip pim neighbor PIM Neighbor Table Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority, P - Proxy Capable, S - State Refresh Capable, G - GenID Capable, L - DR Load-balancing Capable Neighbor Interface Uptime/Expires Ver DR Address Prio/Mode 192.168.0.5 TenGigabitEthernet0/0/2 5d20h/00:01:34 v2 1 / S P G 172.16.0.2 TenGigabitEthernet0/0/5 5d20h/00:01:15 v2 1 / DR S P G Mcast_SR#show ip pim interface Address Interface Ver/ Nbr Query DR DR Mode Count Intvl Prior 10.100.100.1 Loopback0 v2/S 0 30 1 10.100.100.1 192.168.0.6 TenGigabitEthernet0/0/2 v2/S 1 30 1 192.168.0.6 172.16.0.1 TenGigabitEthernet0/0/5 v2/S 1 30 1 172.16.0.2 172.16.101.1 Vif1 v2/S 0 30 1 0.0.0.0 Mcast_SR#show ip pim rp mapping PIM Group-to-RP Mappings Group(s): 224.0.0.0/4, Static RP: 10.100.100.1 (?)Mcast_SR#show ip multicast Multicast Routing: enabled Multicast Multipath: disabled Multicast Route limit: No limit Multicast Fallback group mode: Sparse Number of multicast boundaries configured with filter-autorp option: 0 MoFRR: Disabled Multicast Service-Reflect Capabilities: Multicast to Multicast Unicast to Multicast Multicast to Unicast
All'LHR, verifiche simili sono completate. L'output successivo tratto dal router ASR1000 mostra le route installate per l'origine multicast tradotta 172.16.101.2 (questo è importante da notare perché a questo punto il pacchetto del flusso multicast viene ricevuto con una nuova intestazione IPv4 di origine e destinazione) e per l'indirizzo IPv4 RP 10.100.100.1. Si noti che LHR è anche raggiungibile con l'origine multicast 192.168.0.2 originale, tuttavia a questo punto della topologia è più importante avere la raggiungibilità con la subnet Vif (172.16.101.0/30):
ASR1000#show ip route 10.100.100.1 Routing entry for 10.100.100.1/32 Known via "bgp 65002", distance 20, metric 0 Tag 65001, type external Last update from 172.16.0.1 2d22h ago Routing Descriptor Blocks: * 172.16.0.1, from 172.16.0.1, 2d22h ago opaque_ptr 0x7F2BFA855B80 Route metric is 0, traffic share count is 1 AS Hops 1 Route tag 65001 MPLS label: none ASR1000#ping 10.100.100.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 10.100.100.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms ASR1000#show ip route 172.16.101.1 Routing entry for 172.16.101.0/30 Known via "bgp 65002", distance 20, metric 0 Tag 65001, type external Last update from 172.16.0.1 2d00h ago Routing Descriptor Blocks: * 172.16.0.1, from 172.16.0.1, 2d00h ago opaque_ptr 0x7F2BFA855B80 Route metric is 0, traffic share count is 1 AS Hops 1 Route tag 65001 MPLS label: none ASR1000#ping 172.16.101.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.101.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms ASR1000#show ip pim neighbor PIM Neighbor Table Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority, P - Proxy Capable, S - State Refresh Capable, G - GenID Capable, L - DR Load-balancing Capable Neighbor Interface Uptime/Expires Ver DR Address Prio/Mode 172.16.0.1 TenGigabitEthernet0/1/1 2d22h/00:01:24 v2 1 / S P G ASR1000#show ip pim interface Address Interface Ver/ Nbr Query DR DR Mode Count Intvl Prior 172.16.0.5 GigabitEthernet0/0/0 v2/S 0 30 1 172.16.0.5 172.16.0.2 TenGigabitEthernet0/1/1 v2/S 1 30 1 172.16.0.2ASR1000#show ip route 192.168.0.2 Routing entry for 192.168.0.0/30 Known via "bgp 65002", distance 20, metric 0 Tag 65001, type external Last update from 172.16.0.1 5d21h ago Routing Descriptor Blocks: * 172.16.0.1, from 172.16.0.1, 5d21h ago opaque_ptr 0x7F2BFA855E00 Route metric is 0, traffic share count is 1 AS Hops 2 Route tag 65001 MPLS label: none ASR1000#ping 192.168.0.2 source 172.16.0.5 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.0.2, timeout is 2 seconds: Packet sent with a source address of 172.16.0.5 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
Risoluzione dei problemi
Dopo che la sorgente multicast ha iniziato a inviare il flusso per il gruppo 239.5.5.5 e ha abilitato il debug ip pim sui diversi dispositivi nella topologia, è possibile confermare che la FHR registri la sorgente multicast 192.168.0.2 alla RP e aggiunga l'interfaccia TenGigabit Ethernet1/0/3 alla lista delle interfacce in uscita (OIL).
C9000#
*Oct 16 16:23:01.817: PIM(0)[default]: Re-check RP 10.100.100.1 into the (*, 239.5.5.5) entry
*Oct 16 16:23:01.817: PIM(0)[default]: Building Triggered (*,G) Join / (S,G,RP-bit) Prune message for 239.5.5.5
*Oct 16 16:23:01.817: PIM(0)[default]: Adding register encap tunnel (Tunnel0) as forwarding interface of (192.168.0.2, 239.5.5.5).
*Oct 16 16:23:01.839: PIM(0)[default]: Received v2 Join/Prune on TenGigabitEthernet1/0/3 from 192.168.0.6, to us
*Oct 16 16:23:01.839: PIM(0)[default]: Join-list: (192.168.0.2/32, 239.5.5.5), S-bit set
*Oct 16 16:23:01.839: PIM(0)[default]: MIDB Add TenGigabitEthernet1/0/3/192.168.0.6 to (192.168.0.2, 239.5.5.5), Forward state, by PIM SG Join
*Oct 16 16:23:01.839: PIM(0)[default]: Join to 0.0.0.0 on TenGigabitEthernet1/0/6 for (192.168.0.2, 239.5.5.5), Ignored.
*Oct 16 16:23:03.869: PIM(0)[default]: Received v2 Join/Prune on TenGigabitEthernet1/0/3 from 192.168.0.6, to us
*Oct 16 16:23:03.869: PIM(0)[default]: Join-list: (192.168.0.2/32, 239.5.5.5), S-bit set
*Oct 16 16:23:03.869: PIM(0)[default]: MIDB Update TenGigabitEthernet1/0/3/192.168.0.6 to (192.168.0.2, 239.5.5.5), Forward state, by PIM SG Join
*Oct 16 16:23:05.818: PIM(0)[default]: Received v2 Register-Stop on TenGigabitEthernet1/0/3 from 10.100.100.1 *Oct 16 16:23:05.818: PIM(0)[default]: for source 192.168.0.2, group 239.5.5.5
*Oct 16 16:23:05.818: PIM(0)[default]: Removing register encap tunnel (Tunnel0) as forwarding interface of (192.168.0.2, 239.5.5.5).
*Oct 16 16:23:05.818: PIM(0)[default]: Clear Registering flag to 10.100.100.1 for (192.168.0.2/32, 239.5.5.5)
*Oct 16 16:23:11.997: PIM(0)[default]: Send v2 join/prune to 192.168.0.6 (TenGigabitEthernet1/0/3)
C9000#show ip mroute 239.5.5.5 IP Multicast Routing Table Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected, L - Local, P - Pruned, R - RP-bit set, F - Register flag, T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet, X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement, U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel, z - MDT-data group sender, Y - Joined MDT-data group, y - Sending to MDT-data group, G - Received BGP C-Mroute, g - Sent BGP C-Mroute, N - Received BGP Shared-Tree Prune, n - BGP C-Mroute suppressed, Q - Received BGP S-A Route, q - Sent BGP S-A Route, V - RD & Vector, v - Vector, p - PIM Joins on route, x - VxLAN group, c - PFP-SA cache created entry, * - determined by Assert, # - iif-starg configured on rpf intf, e - encap-helper tunnel flag, l - LISP decap ref count contributor Outgoing interface flags: H - Hardware switched, A - Assert winner, p - PIM Join t - LISP transit group Timers: Uptime/Expires Interface state: Interface, Next-Hop or VCD, State/Mode (*, 239.5.5.5), 00:24:22/stopped, RP 10.100.100.1, flags: SPF Incoming interface: TenGigabitEthernet1/0/3, RPF nbr 192.168.0.6 Outgoing interface list: Null (192.168.0.2, 239.5.5.5), 00:24:22/00:03:11, flags: FT Incoming interface: TenGigabitEthernet1/0/6, RPF nbr 0.0.0.0 Outgoing interface list: TenGigabitEthernet1/0/3, Forward/Sparse, 00:24:22/00:02:47, flags: Allo stesso tempo, il router Multicast Service Reflector (che è anche l'RP per entrambi i gruppi) riceve la registrazione per S,G (192.168.0.2, 239.5.5.5) e rileva immediatamente che questo gruppo rientra nella regola di riflessione precedentemente definita. Aggiunge quindi TenGigabit Ethernet0/0/2 come interfaccia in ingresso per il flusso 239.5.5.5 e in seguito registra il nuovo S,G (172.16.101.2, 239.55.55.55) su se stesso. Il router aggiunge il Vif1 come interfaccia in entrata per il flusso 239.55.55.55 e inserisce TenGigabit Ethernet0/0/5 (collegato ad ASR1000) nell'OIL, come mostrato nell'output del comando debug e show ip route:
Mcast_SR#
*Oct 16 15:46:11.758: PIM(0)[default]: Received v2 Register on TenGigabitEthernet0/0/2 from 192.168.0.5 *Oct 16 15:46:11.758: for 192.168.0.2, group 239.5.5.5
*Oct 16 15:46:11.758: PIM(0)[default]: Adding register decap tunnel (Tunnel1) as accepting interface of (192.168.0.2, 239.5.5.5). *Oct 16 15:46:11.758: MSR(0)[default]: Add 239.5.5.5 to all the SR rules *Oct 16 15:46:11.758: MSR: Found Grp idx 553648130 for rule 239.5.5.5->239.55.55.55 *Oct 16 15:46:11.758: MSR: Found Grp idx 553648130 for rule 239.5.5.5->239.55.55.55
*Oct 16 15:46:11.758: PIM(0)[default]: Insert (192.168.0.2,239.5.5.5) join in nbr 192.168.0.5's queue
*Oct 16 15:46:11.758: PIM(0)[default]: Building Join/Prune packet for nbr 192.168.0.5
*Oct 16 15:46:11.758: PIM(0)[default]: Adding v2 (192.168.0.2/32, 239.5.5.5), S-bit Join
*Oct 16 15:46:11.758: PIM(0)[default]: Send v2 join/prune to 192.168.0.5 (TenGigabitEthernet0/0/2)
*Oct 16 15:46:12.929: PIM(0)[default]: Building Periodic (*,G) Join / (S,G,RP-bit) Prune message for 239.55.55.55
*Oct 16 15:46:12.929: PIM(0)[default]: rp our address for group 239.55.55.55
*Oct 16 15:46:13.251: PIM(0)[default]: Received v2 Join/Prune on TenGigabitEthernet0/0/5 from 172.16.0.2, to us
*Oct 16 15:46:13.251: PIM(0)[default]: Join-list: (*, 239.55.55.55), RPT-bit set, WC-bit set, S-bit set
*Oct 16 15:46:13.252: PIM(0)[default]: MIDB Update TenGigabitEthernet0/0/5/172.16.0.2 to (*, 239.55.55.55), Forward state, by PIM *G Join
*Oct 16 15:46:13.732: PIM(0)[default]: Received v2 Register on TenGigabitEthernet0/0/2 from 192.168.0.5
*Oct 16 15:46:13.732: for 192.168.0.2, group 239.5.5.5
*Oct 16 15:46:13.732: PIM(0)[default]: Removing register decap tunnel (Tunnel1) as accepting interface of (192.168.0.2, 239.5.5.5).
*Oct 16 15:46:13.732: PIM(0)[default]: Installing TenGigabitEthernet0/0/2 as accepting interface for (192.168.0.2, 239.5.5.5).
*Oct 16 15:46:13.732: PIM(0)[default]: Prune to 0.0.0.0 on for (192.168.0.2, 239.5.5.5), Ignored.
*Oct 16 15:46:13.773: PIM(0)[default]: Adding register decap tunnel (Tunnel1) as accepting interface of (172.16.101.2, 239.55.55.55). *Oct 16 15:46:13.773: PIM(0)[default]: Adding register encap tunnel (Tunnel0) as forwarding interface of (172.16.101.2, 239.55.55.55).
*Oct 16 15:46:13.773: PIM(0)[default]: Removing register decap tunnel (Tunnel1) as accepting interface of (172.16.101.2, 239.55.55.55).
*Oct 16 15:46:13.773: PIM(0)[default]: Installing Vif1 as accepting interface for (172.16.101.2, 239.55.55.55).
*Oct 16 15:46:13.788: PIM(0)[default]: Insert (192.168.0.2,239.5.5.5) join in nbr 192.168.0.5's queue
*Oct 16 15:46:13.788: PIM(0)[default]: Building Join/Prune packet for nbr 192.168.0.5
*Oct 16 15:46:13.788: PIM(0)[default]: Adding v2 (192.168.0.2/32, 239.5.5.5), S-bit Join
*Oct 16 15:46:13.788: PIM(0)[default]: Send v2 join/prune to 192.168.0.5 (TenGigabitEthernet0/0/2)
*Oct 16 15:46:13.794: PIM(0)[default]: Received v2 Register on Vif1 from 10.100.100.1
*Oct 16 15:46:13.794: for 172.16.101.2, group 239.55.55.55
*Oct 16 15:46:13.794: PIM(0)[default]: Send v2 Register-Stop to 10.100.100.1 for 172.16.101.2, group 239.55.55.55
*Oct 16 15:46:13.794: PIM(0)[default]: Received v2 Register-Stop on Loopback0 from 10.100.100.1
*Oct 16 15:46:13.794: PIM(0)[default]: for source 172.16.101.2, group 239.55.55.55
*Oct 16 15:46:13.794: PIM(0)[default]: Removing register encap tunnel (Tunnel0) as forwarding interface of (172.16.101.2, 239.55.55.55).
*Oct 16 15:46:13.794: PIM(0)[default]: Clear Registering flag to 10.100.100.1 for (172.16.101.2/32, 239.55.55.55)
*Oct 16 15:46:13.809: PIM(0)[default]: Received v2 Join/Prune on TenGigabitEthernet0/0/5 from 172.16.0.2, to us
*Oct 16 15:46:13.809: PIM(0)[default]: Join-list: (172.16.101.2/32, 239.55.55.55), S-bit set
*Oct 16 15:46:13.809: PIM(0)[default]: MIDB Update TenGigabitEthernet0/0/5/172.16.0.2 to (172.16.101.2, 239.55.55.55), Forward state, by PIM SG Join
Mcast_SR#show ip mroute IP Multicast Routing Table Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected, L - Local, P - Pruned, R - RP-bit set, F - Register flag, T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet, X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement, U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel, z - MDT-data group sender, Y - Joined MDT-data group, y - Sending to MDT-data group, G - Received BGP C-Mroute, g - Sent BGP C-Mroute, N - Received BGP Shared-Tree Prune, n - BGP C-Mroute suppressed, Q - Received BGP S-A Route, q - Sent BGP S-A Route, V - RD & Vector, v - Vector, p - PIM Joins on route, x - VxLAN group, c - PFP-SA cache created entry, * - determined by Assert, # - iif-starg configured on rpf intf, e - encap-helper tunnel flag, l - LISP decap ref count contributor Outgoing interface flags: H - Hardware switched, A - Assert winner, p - PIM Join t - LISP transit group Timers: Uptime/Expires Interface state: Interface, Next-Hop or VCD, State/Mode (*, 239.5.5.5), 00:50:36/stopped, RP 10.100.100.1, flags: SJC Incoming interface: Null, RPF nbr 0.0.0.0 Outgoing interface list: Vif1, Forward/Sparse, 00:50:36/00:00:23, flags: (192.168.0.2, 239.5.5.5), 00:10:08/00:02:36, flags: T Incoming interface: TenGigabitEthernet0/0/2, RPF nbr 192.168.0.5 Outgoing interface list: Vif1, Forward/Sparse, 00:10:08/00:01:51, flags: (*, 239.55.55.55), 00:50:21/00:03:11, RP 10.100.100.1, flags: SF Incoming interface: Null, RPF nbr 0.0.0.0 Outgoing interface list: TenGigabitEthernet0/0/5, Forward/Sparse, 00:50:21/00:03:11, flags: (172.16.101.2, 239.55.55.55), 00:10:06/00:03:23, flags: FT Incoming interface: Vif1, RPF nbr 0.0.0.0 Outgoing interface list: TenGigabitEthernet0/0/5, Forward/Sparse, 00:10:06/00:03:16, flags: (*, 224.0.1.40), 00:50:36/00:03:28, RP 10.100.100.1, flags: SJCL Incoming interface: Null, RPF nbr 0.0.0.0 Outgoing interface list: TenGigabitEthernet0/0/2, Forward/Sparse, 00:50:13/00:03:28, flags: TenGigabitEthernet0/0/5, Forward/Sparse, 00:50:28/00:03:10, flags: Loopback0, Forward/Sparse, 00:50:36/00:02:17, flags: Nota: per poter osservare le regole di riflessione del servizio multicast utilizzate nell'output del debug, è necessario abilitare il servizio multicast debug ip. Tenere presente che questo particolare debug è stato introdotto in Cisco IOS-XE versione 17.9.1a e per ulteriori informazioni consultare la sezione Feature Information for Multicast Service Reflection della guida alla configurazione del multicast IP, Cisco IOS XE 17.x
Dall'output precedente del comando show ip route, è possibile verificare la presenza di voci *,G e S,G sia per il gruppo multicast originale che per quello nuovo. Inoltre, l'uso del comando show ip route <group>count può fornire un'idea dei pacchetti ricevuti e inoltrati per ciascun flusso multicast. Questo output è utile anche per identificare l'inoltro del traffico tramite la conferma dei contatori incrementali:
Mcast_SR#show ip mroute 239.5.5.5 count
Use "show ip mfib count" to get better response time for a large number of mroutes.
IP Multicast Statistics
5 routes using 5796 bytes of memory
3 groups, 0.66 average sources per group
Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kilobits per second
Other counts: Total/RPF failed/Other drops(OIF-null, rate-limit etc)
Group: 239.5.5.5, Source count: 1, Packets forwarded: 4053, Packets received: 4056
RP-tree: Forwarding: 11/0/100/0, Other: 12/1/0
Source: 192.168.0.2/32, Forwarding: 4042/0/113/0, Other: 4044/2/0
Mcast_SR#show ip mroute 239.5.5.5 count
Use "show ip mfib count" to get better response time for a large number of mroutes.
IP Multicast Statistics
5 routes using 5796 bytes of memory
3 groups, 0.66 average sources per group
Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kilobits per second
Other counts: Total/RPF failed/Other drops(OIF-null, rate-limit etc)
Group: 239.5.5.5, Source count: 1, Packets forwarded: 4058, Packets received: 4061
RP-tree: Forwarding: 11/0/100/0, Other: 12/1/0
Source: 192.168.0.2/32, Forwarding: 4047/0/113/0, Other: 4049/2/0
Mcast_SR#show ip mroute 239.55.55.55 count
Use "show ip mfib count" to get better response time for a large number of mroutes.
IP Multicast Statistics
5 routes using 5796 bytes of memory
3 groups, 0.66 average sources per group
Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kilobits per second
Other counts: Total/RPF failed/Other drops(OIF-null, rate-limit etc)
Group: 239.55.55.55, Source count: 1, Packets forwarded: 4046, Packets received: 4046
RP-tree: Forwarding: 0/0/0/0, Other: 0/0/0
Source: 172.16.101.2/32, Forwarding: 4046/0/114/0, Other: 4046/0/0
Mcast_SR#show ip mroute 239.55.55.55 count
Use "show ip mfib count" to get better response time for a large number of mroutes.
IP Multicast Statistics
5 routes using 5796 bytes of memory
3 groups, 0.66 average sources per group
Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kilobits per second
Other counts: Total/RPF failed/Other drops(OIF-null, rate-limit etc)
Group: 239.55.55.55, Source count: 1, Packets forwarded: 4051, Packets received: 4051
RP-tree: Forwarding: 0/0/0/0, Other: 0/0/0
Source: 172.16.101.2/32, Forwarding: 4051/0/114/0, Other: 4051/0/0Se le voci S,G non vengono create, è importante determinare se i pacchetti multicast vengono ricevuti all'interfaccia prevista. Per verificare questa situazione, è possibile utilizzare un'interfaccia EPC (Embedded Packet Capture) o una traccia del pacchetto. Nell'output successivo, un'interfaccia EPC è stata acquisita nelle interfacce in entrata (Te0/0/2) e in uscita (Te0/0/5) dal router C8000. In questo scenario di lavoro, è possibile osservare il flusso multicast originale 239.5.5.5 in entrata e il nuovo flusso 239.55.55.5 in uscita dal router:
Mcast_SR#monitor capture msr buffer size 10 match any interface tenGigabitEthernet 0/0/2 in
Mcast_SR#monitor capture msr start
Started capture point : msr
*Oct 16 17:59:06.986: %BUFCAP-6-ENABLE: Capture Point msr enabled.
Mcast_SR#monitor capture msr stop
Stopped capture point : msr
Mcast_SR#s
*Oct 16 17:59:25.699: %BUFCAP-6-DISABLE: Capture Point msr disabled
Mcast_SR#show monitor capture msr buffer brief
----------------------------------------------------------------------------
# size timestamp source destination dscp protocol
----------------------------------------------------------------------------
0 114 0.000000 192.168.0.2 -> 239.5.5.5 0 BE ICMP
1 114 2.000000 192.168.0.2 -> 239.5.5.5 0 BE ICMP
2 68 2.979961 192.168.0.5 -> 224.0.0.13 48 CS6 PIM
3 114 4.000000 192.168.0.2 -> 239.5.5.5 0 BE ICMP
4 114 6.000000 192.168.0.2 -> 239.5.5.5 0 BE ICMP
5 114 8.000000 192.168.0.2 -> 239.5.5.5 0 BE ICMP
6 114 10.000000 192.168.0.2 -> 239.5.5.5 0 BE ICMP
7 114 12.000000 192.168.0.2 -> 239.5.5.5 0 BE ICMP
8 114 14.001007 192.168.0.2 -> 239.5.5.5 0 BE ICMP
9 114 16.001999 192.168.0.2 -> 239.5.5.5 0 BE ICMP
10 114 18.001007 192.168.0.2 -> 239.5.5.5 0 BE ICMP
Mcast_SR#monitor capture msr buffer size 10 match any interface tenGigabitEthernet0/0/5 out
Mcast_SR#monitor capture msr start
Started capture point : msr
*Oct 16 18:07:26.846: %BUFCAP-6-ENABLE: Capture Point msr enabled.
Mcast_SR#monitor capture msr stop
Stopped capture point : msr
*Oct 16 18:07:50.360: %BUFCAP-6-DISABLE: Capture Point msr disabled.
Mcast_SR#show monitor capture msr buffer brief
----------------------------------------------------------------------------
# size timestamp source destination dscp protocol
----------------------------------------------------------------------------
0 73 0.000000 172.16.0.1 -> 172.16.0.2 48 CS6 TCP
1 114 0.172040 172.16.101.2 -> 239.55.55.55 0 BE ICMP 2 114 2.173047 172.16.101.2 -> 239.55.55.55 0 BE ICMP
3 114 4.172040 172.16.101.2 -> 239.55.55.55 0 BE ICMP
4 114 6.173047 172.16.101.2 -> 239.55.55.55 0 BE ICMP
5 114 8.172040 172.16.101.2 -> 239.55.55.55 0 BE ICMP
6 114 10.172040 172.16.101.2 -> 239.55.55.55 0 BE ICMP
7 114 12.173047 172.16.101.2 -> 239.55.55.55 0 BE ICMP
8 114 14.175046 172.16.101.2 -> 239.55.55.55 0 BE ICMP
9 114 16.176038 172.16.101.2 -> 239.55.55.55 0 BE ICMP
10 114 18.176038 172.16.101.2 -> 239.55.55.55 0 BE ICMP
11 46 19.318029 172.16.0.1 -> 224.0.0.1 48 CS6 IGMP
12 114 20.177045 172.16.101.2 -> 239.55.55.55 0 BE ICMP
13 72 20.629017 172.16.0.1 -> 224.0.0.13 48 CS6 PIM
14 114 22.178037 172.16.101.2 -> 239.55.55.55 0 BE ICMP
15 430 23.273033 90:77:EE:3C:80:05 -> 01:00:0C:CC:CC:CC -- LLCInoltre, è stata implementata una traccia dei pacchetti con un filtro ACL (Access Control List) esteso su 239.5.5.5. Dall'output successivo si può osservare che i pacchetti vengono ricevuti all'interfaccia Te0/0/2 e inizialmente consumati e copiati internamente per essere poi utilizzati come pacchetti di input nell'interfaccia Vif1 e poi inoltrati tradotti attraverso l'interfaccia Te0/0/5:
Mcast_SR#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Mcast_SR(config)#ip access-list extended original-mcast Mcast_SR(config-ext-nacl)#permit ip any host 239.5.5.5 Mcast_SR(config-ext-nacl)#end Mcast_SR# *Oct 16 18:31:49.187: %SYS-5-CONFIG_I: Configured from console by console Mcast_SR#debug platform packet-trace packet 16 Please remember to turn on 'debug platform condition start' for packet-trace to work Mcast_SR#debug platform condition ipv4 access-list original-mcast ingress Mcast_SR#debug platform condition start Mcast_SR#show platform packet-trace packet all Packet: 0 CBUG ID: 0 Summary Input : TenGigabitEthernet0/0/2 Output :State : CONS Packet Consumed Silently Timestamp Start : 521286121898055 ns (10/16/2023 18:33:39.36879 UTC) Stop : 521286122522268 ns (10/16/2023 18:33:39.37503 UTC) Path Trace Feature: IPV4(Input) Input : TenGigabitEthernet0/0/2 Output : Source : 192.168.0.2 Destination : 239.5.5.5 Protocol : 1 (ICMP) Packet: 1 CBUG ID: 0 Summary Input : TenGigabitEthernet0/0/2 Output : State : CONS Packet Consumed Silently Timestamp Start : 521286121980895 ns (10/16/2023 18:33:39.36962 UTC) Stop : 521286122618968 ns (10/16/2023 18:33:39.37600 UTC) Path Trace Feature: PACKET_COPY Original packet number: 0 Feature: IPV4(Input) Input : TenGigabitEthernet0/0/2 Output : Source : 192.168.0.2 Destination : 239.5.5.5 Protocol : 1 (ICMP) Packet: 2 CBUG ID: 0 Summary Input : Vif1 Output : TenGigabitEthernet0/0/5 State : FWD Timestamp Start : 521286122038938 ns (10/16/2023 18:33:39.37020 UTC) Stop : 521286122694795 ns (10/16/2023 18:33:39.37676 UTC) Path Trace Feature: PACKET_COPY Original packet number: 1 Feature: IPV4(Input) Input : Vif1 Output : Source : 172.16.101.2 Destination : 239.55.55.55 Protocol : 1 (ICMP)
È importante anche controllare il Multicast Routing Information Base (MRIB) e il Multicast Forwarding Information Base (MFIB) sul Catalyst 8K. Si notino i flag hardware installato (HW) e i contatori di inoltro hardware che aumentano con un numero idealmente ridotto di errori o perdite di Reverse Path Forwarding (RPF). Notare anche il flag forward (F) associato all'interfaccia in uscita (Te0/0/5) verso il router ASR1000:
Mcast_SR#show ip mrib route IP Multicast Routing Information Base Entry flags: L - Domain-Local Source, E - External Source to the Domain, C - Directly-Connected Check, S - Signal, IA - Inherit Accept, D - Drop ET - Data Rate Exceeds Threshold,K - Keepalive,DDE - Data Driven Event ME - MoFRR ECMP Flow based, MNE - MoFRR Non-ECMP Flow based, MP - Primary MoFRR Non-ECMP Flow based entry, e - Encap helper tunnel flag Interface flags: F - Forward, A - Accept, IC - Internal Copy, NS - Negate Signal, DP - Don't Preserve, SP - Signal Present, II - Internal Interest, ID - Internal Disinterest, LI - Local Interest, LD - Local Disinterest, MD - mCAC Denied, MI - mLDP Interest A2 - MoFRR ECMP Backup Accept (*,224.0.0.0/4) Flags: C (*,224.0.1.40) RPF nbr: 0.0.0.0 Flags: C TenGigabitEthernet0/0/2 Flags: F NS TenGigabitEthernet0/0/5 Flags: F NS Loopback0 Flags: F IC NS Tunnel1 Flags: A (*,239.5.5.5) RPF nbr: 0.0.0.0 Flags: C Vif1 Flags: F NS SR(172.16.101.2, 239.55.55.55) Index(2, 2) Tunnel1 Flags: A (*,239.55.55.55) RPF nbr: 0.0.0.0 Flags: C TenGigabitEthernet0/0/5 Flags: F NS Tunnel1 Flags: A (172.16.101.2,239.55.55.55) RPF nbr: 0.0.0.0 Flags: Vif1 Flags: A TenGigabitEthernet0/0/5 Flags: F NS (192.168.0.2,239.5.5.5) RPF nbr: 192.168.0.5 Flags: TenGigabitEthernet0/0/2 Flags: A NS Vif1 Flags: F NS SR(172.16.101.2, 239.55.55.55) Index(2, 2) Mcast_SR#show ip mfib 192.168.0.2 239.5.5.5 Entry Flags: C - Directly Connected, S - Signal, IA - Inherit A flag, ET - Data Rate Exceeds Threshold, K - Keepalive DDE - Data Driven Event, HW - Hardware Installed ME - MoFRR ECMP entry, MNE - MoFRR Non-ECMP entry, MP - MFIB MoFRR Primary, RP - MRIB MoFRR Primary, P - MoFRR Primary MS - MoFRR Entry in Sync, MC - MoFRR entry in MoFRR Client, e - Encap helper tunnel flag. I/O Item Flags: IC - Internal Copy, NP - Not platform switched, NS - Negate Signalling, SP - Signal Present, A - Accept, F - Forward, RA - MRIB Accept, RF - MRIB Forward, MA - MFIB Accept, A2 - Accept backup, RA2 - MRIB Accept backup, MA2 - MFIB Accept backup Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kbits per second Other counts: Total/RPF failed/Other drops I/O Item Counts: HW Pkt Count/FS Pkt Count/PS Pkt Count Egress Rate in pps Default (192.168.0.2,239.5.5.5) Flags: HW SW Forwarding: 1/0/100/0, Other: 0/0/0 HW Forwarding: 6530/0/114/0, Other: 2/2/0 TenGigabitEthernet0/0/2 Flags: A Vif1, SR/(172.16.101.2,239.55.55.55):553648130 Flags: F NS Pkts: 0/0/1 Rate: 0 pps Mcast_SR#show ip mfib 172.16.101.2 239.55.55.55 Entry Flags: C - Directly Connected, S - Signal, IA - Inherit A flag, ET - Data Rate Exceeds Threshold, K - Keepalive DDE - Data Driven Event, HW - Hardware Installed ME - MoFRR ECMP entry, MNE - MoFRR Non-ECMP entry, MP - MFIB MoFRR Primary, RP - MRIB MoFRR Primary, P - MoFRR Primary MS - MoFRR Entry in Sync, MC - MoFRR entry in MoFRR Client, e - Encap helper tunnel flag. I/O Item Flags: IC - Internal Copy, NP - Not platform switched, NS - Negate Signalling, SP - Signal Present, A - Accept, F - Forward, RA - MRIB Accept, RF - MRIB Forward, MA - MFIB Accept, A2 - Accept backup, RA2 - MRIB Accept backup, MA2 - MFIB Accept backup Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kbits per second Other counts: Total/RPF failed/Other drops I/O Item Counts: HW Pkt Count/FS Pkt Count/PS Pkt Count Egress Rate in pps Default (172.16.101.2,239.55.55.55) Flags: HW SW Forwarding: 0/0/0/0, Other: 0/0/0 HW Forwarding: 6550/0/114/0, Other: 0/0/0 Vif1 Flags: A TenGigabitEthernet0/0/5 Flags: F NS Pkts: 0/0/0 Rate: 0 pps Mcast_SR#show adjacency vif1 detail Protocol Interface Address IP Vif1 point2point(8) 13270 packets, 657502 bytes epoch 0 sourced in sev-epoch 0 empty encap string P2P-ADJMcast_SR#show platform software ip rp active mfib group 239.5.5.5/32 Route flags: S - Signal; C - Directly connected; IA - Inherit A Flag; L - Local; BR - Bidir route *, 239.5.5.5/32 --> OBJ_INTF_LIST (0x15) Obj id: 0x15, Flags: C OM handle: 0x3480200a50 Mcast_SR#show platform software ip rp active mfib group 239.55.55.55/32 Route flags: S - Signal; C - Directly connected; IA - Inherit A Flag; L - Local; BR - Bidir route *, 239.55.55.55/32 --> OBJ_INTF_LIST (0x36) Obj id: 0x36, Flags: C OM handle: 0x34801fa988 Mcast_SR#show platform software mlist rp active index 0x15 Multicast List entries OCE Flags: NS - Negate Signalling; IC - Internal copy; A - Accept; F - Forward; OCE Type OCE Flags Interface -------------------------------------------------------------------------------------- 0xf8000029 OBJ_ADJACENCY NS, F Vif1 0xf8000186 OBJ_ADJACENCY A Tunnel1 Mcast_SR#show platform software mlist rp active index 0x36 Multicast List entries OCE Flags: NS - Negate Signalling; IC - Internal copy; A - Accept; F - Forward; OCE Type OCE Flags Interface -------------------------------------------------------------------------------------- 0xf80000d1 OBJ_ADJACENCY NS, F TenGigabitEthernet0/0/5 0xf8000186 OBJ_ADJACENCY A Tunnel1
Per il controllo RPF, è importante verificare questa condizione sui diversi dispositivi nel percorso multicast.
C9000#show ip rpf 192.168.0.2
RPF information for ? (192.168.0.2)
RPF interface: TenGigabitEthernet1/0/6
RPF neighbor: ? (192.168.0.2) - directly connected
RPF route/mask: 192.168.0.0/30
RPF type: multicast (connected)
Doing distance-preferred lookups across tables
RPF topology: ipv4 multicast base
Mcast_SR#show ip rpf 192.168.0.2
RPF information for ? (192.168.0.2)
RPF interface: TenGigabitEthernet0/0/2
RPF neighbor: ? (192.168.0.5)
RPF route/mask: 192.168.0.0/30
RPF type: unicast (bgp 65001)
Doing distance-preferred lookups across tables
RPF topology: ipv4 multicast base, originated from ipv4 unicast base
Mcast_SR#show ip rpf 172.16.101.2
RPF information for ? (172.16.101.2)
RPF interface: Vif1
RPF neighbor: ? (172.16.101.2) - directly connected
RPF route/mask: 172.16.101.0/30
RPF type: multicast (connected)
Doing distance-preferred lookups across tables
RPF topology: ipv4 multicast base
ASR1000#show ip rpf 172.16.101.2
RPF information for ? (172.16.101.2)
RPF interface: TenGigabitEthernet0/1/1
RPF neighbor: ? (172.16.0.1)
RPF route/mask: 172.16.101.0/30
RPF type: unicast (bgp 65002)
Doing distance-preferred lookups across tables
RPF topology: ipv4 multicast base, originated from ipv4 unicast baseInfine, per confermare il traffico in ricezione e inoltrato all'LHR, la prima acquisizione mostra come ASR1000 ha ricevuto i pacchetti dal nuovo flusso (172.16.101.2, 239.55.55.55) in cui gli indirizzi IPv4 sono stati tradotti come previsto. La seconda acquisizione mostra il traffico inoltrato al ricevitore.
ASR1000#monitor capture LHR buffer size 10 match any interface TenGigabitEthernet 0/1/1 in
ASR1000#monitor capture LHR start
Started capture point : LHR
*Oct 17 15:16:06.192: %BUFCAP-6-ENABLE: Capture Point LHR enabled.show moni
ASR1000#show monitor capture LHR buffer brief
----------------------------------------------------------------------------
# size timestamp source destination dscp protocol
----------------------------------------------------------------------------
0 73 0.000000 172.16.0.1 -> 172.16.0.2 48 CS6 TCP
1 114 0.050992 172.16.101.2 -> 239.55.55.55 0 BE ICMP 2 114 2.051984 172.16.101.2 -> 239.55.55.55 0 BE ICMP
3 54 2.896993 172.16.0.1 -> 172.16.0.2 48 CS6 TCP
4 114 4.051984 172.16.101.2 -> 239.55.55.55 0 BE ICMP
5 72 4.967989 172.16.0.1 -> 224.0.0.13 48 CS6 PIM
6 114 6.052991 172.16.101.2 -> 239.55.55.55 0 BE ICMP
7 114 8.053983 172.16.101.2 -> 239.55.55.55 0 BE ICMP
8 114 10.053983 172.16.101.2 -> 239.55.55.55 0 BE ICMP
9 114 12.053983 172.16.101.2 -> 239.55.55.55 0 BE ICMP
10 114 14.055997 172.16.101.2 -> 239.55.55.55 0 BE ICMP
11 114 16.056989 172.16.101.2 -> 239.55.55.55 0 BE ICMP
12 114 18.055997 172.16.101.2 -> 239.55.55.55 0 BE ICMP
ASR1000#monitor capture LHR stop
Stopped capture point : LHR
ASR1000#
*Oct 17 15:16:32.029: %BUFCAP-6-DISABLE: Capture Point LHR disabled.
ASR1000#monitor capture TO_RECEIVER buffer size 10 match any interface GigabitEthernet 0/0/0 out
ASR1000#monitor capture TO_RECEIVER start
Started capture point : TO_RECEIVER
*Oct 17 15:19:00.309: %BUFCAP-6-ENABLE: Capture Point TO_RECEIVER enabled.ni
ASR1000#show monitor capture TO_RECEIVER buffer brief
----------------------------------------------------------------------------
# size timestamp source destination dscp protocol
----------------------------------------------------------------------------
0 114 0.000000 172.16.101.2 -> 239.55.55.55 0 BE ICMP
1 46 0.276994 172.16.0.5 -> 224.0.0.1 48 CS6 IGMP
2 114 1.999009 172.16.101.2 -> 239.55.55.55 0 BE ICMP 3 114 4.000000 172.16.101.2 -> 239.55.55.55 0 BE ICMP
4 46 5.550027 172.16.0.5 -> 224.0.1.40 48 CS6 IGMP
5 114 5.999009 172.16.101.2 -> 239.55.55.55 0 BE ICMP
6 114 8.000000 172.16.101.2 -> 239.55.55.55 0 BE ICMP
7 114 10.001007 172.16.101.2 -> 239.55.55.55 0 BE ICMP
8 114 12.001999 172.16.101.2 -> 239.55.55.55 0 BE ICMP
9 114 14.003006 172.16.101.2 -> 239.55.55.55 0 BE ICMP
10 114 16.003998 172.16.101.2 -> 239.55.55.55 0 BE ICMP
ASR1000#monitor capture TO_RECEIVER stop
Stopped capture point : TO_RECEIVER
*Oct 17 15:19:24.938: %BUFCAP-6-DISABLE: Capture Point TO_RECEIVER disabled. Se per qualche motivo l'asterisco *,G non è presente, è possibile convalidare lo stato IGMP (Internet Group Management Protocol) con i comandi show ip igmp membership <group> e show ip igmp groups <group>. In questo scenario, è prevista la visualizzazione di una voce per il gruppo multicast 239.55.55.55 tradotto.
ASR1000#show ip igmp membership 239.55.55.55
Flags: A - aggregate, T - tracked
L - Local, S - static, V - virtual, R - Reported through v3
I - v3lite, U - Urd, M - SSM (S,G) channel
1,2,3 - The version of IGMP, the group is in
Channel/Group-Flags:
/ - Filtering entry (Exclude mode (S,G), Include mode (G))
Reporter:
- last reporter if group is not explicitly tracked
/
-
reporter in include mode,
reporter in exclude Channel/Group Reporter Uptime Exp. Flags Interface
*,239.55.55.55 172.16.0.6 1w0d 02:40 2A Gi0/0/0
ASR1000#show ip igmp groups 239.55.55.55 IGMP Connected Group Membership Group Address Interface Uptime Expires Last Reporter Group Accounted 239.55.55.55 GigabitEthernet0/0/0 01:11:56 00:02:49 172.16.0.6
Inoltre, presso il LHR è possibile effettuare una verifica del percorso per confermare che l'interfaccia verso il ricevitore è stata aggiunta all'OLIO e l'uso di una mtrace per confermare il percorso inverso a entrambe le sorgenti.
ASR1000#show ip mroute 239.55.55.55
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
L - Local, P - Pruned, R - RP-bit set, F - Register flag,
T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report,
Z - Multicast Tunnel, z - MDT-data group sender,
Y - Joined MDT-data group, y - Sending to MDT-data group,
G - Received BGP C-Mroute, g - Sent BGP C-Mroute,
N - Received BGP Shared-Tree Prune, n - BGP C-Mroute suppressed,
Q - Received BGP S-A Route, q - Sent BGP S-A Route,
V - RD & Vector, v - Vector, p - PIM Joins on route,
x - VxLAN group, c - PFP-SA cache created entry,
* - determined by Assert, # - iif-starg configured on rpf intf,
e - encap-helper tunnel flag, l - LISP Decap Refcnt Contributor
Outgoing interface flags: H - Hardware switched, A - Assert winner, p - PIM Join
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 239.55.55.55), 23:28:12/stopped, RP 10.100.100.1, flags: SJC
Incoming interface: TenGigabitEthernet0/1/1, RPF nbr 172.16.0.1
Outgoing interface list:
GigabitEthernet0/0/0, Forward/Sparse, 00:01:52/00:02:48
(172.16.101.2, 239.55.55.55), 00:10:11/00:02:40, flags: JT
Incoming interface: TenGigabitEthernet0/1/1, RPF nbr 172.16.0.1
Outgoing interface list:
GigabitEthernet0/0/0, Forward/Sparse, 00:01:52/00:02:48
ASR1000#mtrace 172.16.101.2 Type escape sequence to abort. Mtrace from 172.16.101.2 to 172.16.0.2 via RPF From source (?) to destination (?) Querying full reverse path... 0 172.16.0.2 -1 172.16.0.2 ==> 172.16.0.2 PIM/MBGP [172.16.101.0/30] -2 172.16.0.1 ==> 172.16.101.1 PIM_MT [172.16.101.0/30] -3 172.16.101.2
ASR1000#mtrace 192.168.0.2 Type escape sequence to abort. Mtrace from 192.168.0.2 to 172.16.0.2 via RPF From source (?) to destination (?) Querying full reverse path... 0 172.16.0.2 -1 172.16.0.2 ==> 172.16.0.2 PIM/MBGP [192.168.0.0/30] -2 172.16.0.1 ==> 192.168.0.6 PIM/MBGP [192.168.0.0/30] -3 192.168.0.5 ==> 192.168.0.1 PIM_MT [192.168.0.0/30] -4 192.168.0.2Informazioni correlate
Cronologia delle revisioni
| Revisione | Data di pubblicazione | Commenti |
|---|---|---|
1.0 |
20-Oct-2023 |
Versione iniziale |
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