晚上好，我的网络在骨干网络上有几台 Cisco 路由器（WS-4900M 和 7606（作为主核心）），不同的 l3 交换机作为客户端接入路由器连接到它们，用于接收 IPTV 多播流量的 igmp 消息。这是一个简单的方案，采用 OSPF+PIM-SM，以 7606 作为集合点（通过 MSDP+MBGP 直接连接多播源）。[网络方案][1]
因此，所有客户端都接收多播流量，但在一个路由器（Core2，见方案）上，我的 CPU 使用率非常高（晚上为 80-90%）（Cat4k Mgmt LoPri），其他的则不到 10%。当我启动调试平台数据包所有缓冲区时，我收到了类似以下消息
Index 2:
54 days 15:56:12:890689 - RxVlan: 1013, RxPort: Te1/8
Priority: High, Tag: No Tag, Event: L3 Forward, Flags: 0x40, Size: 1362
Eth: Src 68:EF:BD:B5:F1:BF Dst 01:00:5E:7F:05:6A Type/Len 0x0800
Ip: ver:IpVersion4 len:20 tos:192 totLen:1344 id:0 fragOffset:0 ttl:19 proto:udp
src: 172.16.255.2 dst: 239.255.5.106 firstFragment lastFragment
显示 ip mroute Core2
(*, 239.255.5.106), 01:51:13/00:03:27, RP 172.23.176.252, flags: S
Incoming interface: TenGigabitEthernet1/8, RPF nbr 172.23.176.69
Outgoing interface list:
TenGigabitEthernet1/2, Forward/Sparse, 01:51:13/00:03:27
显示 ip mroute Core5
(*, 239.255.5.106), 01:51:57/00:03:25, RP 172.23.176.252, flags: S
Incoming interface: Vlan20, RPF nbr 172.23.180.85
Outgoing interface list:
TenGigabitEthernet1/8, Forward/Sparse, 01:51:57/00:02:40, H
显示 ip mroute Core1
(*, 239.255.5.106), 06:11:51/00:03:08, RP 172.23.176.252, flags: S
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Vlan20, Forward/Sparse, 01:52:44/00:03:08
(172.16.255.2, 239.255.5.106), 06:11:51/00:01:36, flags: MT
Incoming interface: Vlan1532, RPF nbr 10.217.0.130
Outgoing interface list:
Vlan20, Forward/Sparse, 01:52:44/00:03:08
因此，正如您所看到的，由于某种原因，我的缓冲区中有很多多播，但没有 (S,G) 条目
然后我尝试启动 debug ip pim 并看到 2 种情况，其中有 (S,G) 条目
PIM(0): Received v2 Join/Prune on TenGigabitEthernet1/4 from 172.23.177.114, to us
PIM(0): Join-list: (*, 239.255.2.19), RPT-bit set, WC-bit set, S-bit set
PIM(0): Update TenGigabitEthernet1/4/172.23.177.114 to (*, 239.255.2.19), Forward state, by PIM *G Join
PIM(0): Update TenGigabitEthernet1/4/172.23.177.114 to (172.16.2.250, 239.255.2.19), Forward state, by PIM *G Join
PIM(0): Received v2 Join/Prune on TenGigabitEthernet1/4 from 172.23.177.114, to us
PIM(0): Join-list: (*, 239.255.2.19), RPT-bit set, WC-bit set, S-bit set
PIM(0): Update TenGigabitEthernet1/4/172.23.177.114 to (*, 239.255.2.19), Forward state, by PIM *G Join
PIM(0): Update TenGigabitEthernet1/4/172.23.177.114 to (172.16.2.250, 239.255.2.19), Forward state, by PIM *G Join
PIM(0): Received v2 Join/Prune on TenGigabitEthernet1/4 from 172.23.177.114, to us
PIM(0): Join-list: (172.16.2.250/32, 239.255.2.19), S-bit set
PIM(0): Update TenGigabitEthernet1/4/172.23.177.114 to (172.16.2.250, 239.255.2.19), Forward state, by PIM SG Join
PIM(0): Received v2 Join/Prune on TenGigabitEthernet1/4 from 172.23.177.114, to us
PIM(0): Join-list: (172.16.2.250/32, 239.255.2.19), S-bit set
PIM(0): Update TenGigabitEthernet1/4/172.23.177.114 to (172.16.2.250, 239.255.2.19), Forward state, by PIM SG Join
无（S,G）条目
PIM(0): Received v2 Join/Prune on TenGigabitEthernet1/2 from 172.23.178.130, to us
PIM(0): Join-list: (*, 239.255.40.232), RPT-bit set, WC-bit set, S-bit set
PIM(0): Check RP 172.23.176.252 into the (*, 239.255.40.232) entry
PIM(0): Building Triggered (*,G) Join / (S,G,RP-bit) Prune message for 239.255.40.232
PIM(0): Add TenGigabitEthernet1/2/172.23.178.130 to (*, 239.255.40.232), Forward state, by PIM *G Join
PIM(0): Building Triggered (*,G) Join / (S,G,RP-bit) Prune message for 239.255.40.232
PIM(0): Insert (*,239.255.40.232) join in nbr 172.23.176.69's queue
PIM(0): Received v2 Join/Prune on TenGigabitEthernet1/2 from 172.23.178.130, to us
PIM(0): Join-list: (*, 239.255.40.232), RPT-bit set, WC-bit set, S-bit set
PIM(0): Update TenGigabitEthernet1/2/172.23.178.130 to (*, 239.255.40.232), Forward state, by PIM *G Join
PIM(0): Building Join/Prune packet for nbr 172.23.176.69
PIM(0): Adding v2 (172.23.176.252/32, 239.255.40.232), WC-bit, RPT-bit, S-bit Join
PIM(0): Send v2 join/prune to 172.23.176.69 (TenGigabitEthernet1/8)
您对此有什么想法吗？
显示已排序的 proc cpu
CPU utilization for five seconds: 44%/4%; one minute: 43%; five minutes: 44%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
85 1833127889 1262153216 1452 32.63% 32.41% 32.89% 0 Cat4k Mgmt LoPri
149 237386465 3486312836 0 3.91% 3.91% 3.97% 0 IP Input
84 64265071 309949699 207 2.39% 2.30% 2.35% 0 Cat4k Mgmt HiPri
94 1932693 236735 8163 0.55% 0.06% 0.00% 0 Per-minute Jobs
316 527359 1146186 460 0.15% 0.02% 0.00% 0 SNMP ENGINE
327 2415007 33093035 72 0.15% 0.09% 0.07% 0 OSPF-1 Router
160 44 4724582 0 0.07% 0.00% 0.00% 0 Socket Timers
158 184 45746 4 0.07% 0.00% 0.00% 0 TCP Timer
302 1247740 120242829 10 0.07% 0.05% 0.07% 0 PIM Process
303 4553 47307586 0 0.07% 0.01% 0.00% 0 Mwheel Process
179 48 944992 0 0.07% 0.00% 0.00% 0 Track
280 2044 86069 23 0.07% 0.00% 0.00% 0 Syslog
107 51538 602283450 0 0.07% 0.08% 0.08% 0 Ethernet Msec Ti
320 0 176 0 0.07% 0.00% 0.00% 0 RADIUS
282 63499 51998773 1 0.07% 0.01% 0.00% 0 IGMP Input
314 158722 3068574 51 0.07% 0.00% 0.00% 0 IP SNMP
156 4 47 85 0.07% 0.00% 0.00% 1 Virtual Exec
18 21954 139747 157 0.00% 0.00% 0.00% 0 ARP Input
17 0 1 0 0.00% 0.00% 0.00% 0 ifIndex Receive
20 0 1 0 0.00% 0.00% 0.00% 0 CEF MIB API
16 8 12 666 0.00% 0.00% 0.00% 0 RF Slave Main Th
显示平台健康状况
K5CpuMan Review 30.00 58.50 30 14 100 500 69 73 76 60363:49
Packets Dropped In Processing by CPU event
Event Total 5 sec avg 1 min avg 5 min avg 1 hour avg
----------------- -------------------- --------- --------- --------- ----------
Sa Miss 9 0 0 0 0
L2 Router 5 0 0 0 0
Input ACl Copy 245 0 0 0 0
Packets Dropped In Processing by Priority
Priority Total 5 sec avg 1 min avg 5 min avg 1 hour avg
----------------- -------------------- --------- --------- --------- ----------
Normal 5 0 0 0 0
Medium 9 0 0 0 0
High 245 0 0 0 0
Packets Dropped In Processing by Reason
Reason Total 5 sec avg 1 min avg 5 min avg 1 hour avg
------------------ -------------------- --------- --------- --------- ----------
STPDrop 5 0 0 0 0
Tx Mode Drop 254 0 0 0 0
Total packet queues 64
Packets Received by Packet Queue
Queue Total 5 sec avg 1 min avg 5 min avg 1 hour avg
---------------------- --------------- --------- --------- --------- ----------
Input ACL fwd(snooping) 1388990 0 0 0 0
Host Learning 9 0 0 0 0
L2 Control 1117695 0 0 0 0
Input ACL log, unreach 7630372 1 0 1 0
Ttl Expired 2383808 0 0 0 0
InputIf Fail 1956 0 0 0 0
Adj SameIf Fail 184833357 47 27 27 23
Bfd 187937 0 0 0 0
L2 router to CPU, 7 24908694 4 1 2 3
L3 Glean, 7 31639 0 0 0 0
L3 Fwd, 7 11851731684 5051 5683 4686 4430
L3 Receive, 7 2081299 4 0 0 0
Packets Dropped by Packet Queue
Queue Total 5 sec avg 1 min avg 5 min avg 1 hour avg
---------------------- --------------- --------- --------- --------- ----------
Ttl Expired 118 0 0 0 0
Adj SameIf Fail 50496 0 0 0 0
L3 Glean, 7 1365 0 0 0 0
L3 Fwd, 7 1688513 0 0 0 0
UPD。我刚刚注意到，出于某种原因，Core2 有活动的 Pim Tunnel0，而其他路由器没有。但我不知道如何禁用它。[1]：https://i.stack.imgur.com/sXJlq.png
