First of all we already know what is multicast ? why do we need it? and what is IGPM and its work? in this section we will talk about multicast routing protocol PIM Protocol independent multicast.
IP Multicast Routing Protocols
- Distance vector multicast routing protocol (DVMRP) (legacy)
- Multicast OSPF (MOSPF) (legacy)
- Protocol-independent multicast (PIM)
PIM (Protocol Independent Multicast) is a family of
multicast routing protocols. The word independent comes from the fact that PIM
does not build a topology of its own, it uses the information from IGP routing
protocols to achieve this.
There are several different PIM flavors:
- PIM Sparse-Mode
- PIM Dense-Mode
- Bidirectional PIM
- Source-Specific PIM.
Protocol-independent multicast Provides loop-free router-to-router communication. PIM relies on IGP to figure out if the network is loop-free (using RPF
check). PIM do not advertise the routes throughout the network (like IGP).
PIM (Protocol Independent Multicast) Modes
PIM modes tell how the multicast tree is built from sender
to receiver. PIM mode will decide how the tree is built, and who will receive
traffic.
PIM supports three different modes:
- PIM Dense mode
- PIM Sparse mode
- PIM Sparse-Dense mode
Dense mode Considered as implicit join Use flood and prune behavior
Dense mode: we forward multicast traffic on all
interfaces until a downstream router requests us to stop forwarding.
Pim dense mode Uses implicit join to get traffic even if not asked Also called as flood and prune.
PIM Dense mode Suitable for small multicast implementation. Default hello= 30 sec & dead= 90 sec Discover PIM neighbor (uses 224.0.0.13). Flood all the multicast traffic on all PIM enable interfaces Prune unwanted traffic Maintain multicast table.
PIM Dense mode summary
- PIM floods the multicast packet to all routers in the network and the prunes routers that do not service members of that particular multicast group.
- PIM-dense mode is most useful in the following cases:
- Senders and receivers are near one another.
- There are few senders and many receivers.
- The volume of multicast traffic is high
- The stream of multicast traffic is constant.
Nevertheless, the PIM-dense mode is not the method of choice for enterprise and service provider customers because of its scalability and flooding properties.
.
let's see the configuration for a better understanding:-
Topology:
Topology:
GOAL:
- Configure the topology as per the diagram.
- assign the IP addresses as shown in the diagram.
- configure IGP as EIGRP AS 100
- advertise all the interfaces as per the diagram
- configure IP multicast on all the interfaces using IP PIM dense mode
- for testing configure router 5 FastEthernet 0/0 interface to join multicast group 224.5.5.5
- make sure that all the routers should ping to this multicast group on router 5.
R1#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 10.1.1.1 YES manual up up
Serial3/0 1.1.1.1 YES manual up up
Serial3/3 4.4.4.2 YES manual up up
R2#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 20.1.1.1 YES manual up up
Serial3/0 1.1.1.2 YES manual up up
Serial3/1 2.2.2.1 YES manual up up
Serial3/5 5.5.5.2 YES manual up up
R3#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 30.1.1.1 YES manual up up
Serial3/1 2.2.2.2 YES manual up up
Serial3/2 3.3.3.1 YES manual up up
R4#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 40.1.1.1 YES manual up up
Serial3/2 3.3.3.2 YES manual up up
Serial3/3 4.4.4.1 YES manual up up
R5#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 50.1.1.1 YES manual up up
Serial3/5 5.5.5.1 YES manual up up
R1(config)#router eigrp 100
R1(config-router)#network 10.0.0.0
R1(config-router)#network 4.0.0.0
R1(config-router)#network 1.0.0.0
R1(config-router)#no auto-summary
R1(config-router)#exit
R2(config)#router eigrp 100
R2(config-router)#network 1.0.0.0
R2(config-router)#network 2.0.0.0
R2(config-router)#network 20.0.0.0
R2(config-router)#network 5.0.0.0
R2(config-router)#no auto-summary
R2(config-router)#exit
R3(config)#router eigrp 100
R3(config-router)#network 2.0.0.0
R3(config-router)#network 3.0.0.0
R3(config-router)#network 30.0.0.0
R3(config-router)#no auto-summary
R3(config-router)#exit
R4(config)#router eigrp 100
R4(config-router)#network 3.0.0.0
R4(config-router)#network 4.0.0.0
R4(config-router)#network 40.0.0.0
R4(config-router)#no auto-summary
R4(config-router)#exit
R5(config)#router eigrp 100
R5(config-router)#network 5.0.0.0
R5(config-router)#network 50.0.0.0
R5(config-router)#no auto-summary
R5(config-router)#exit
R1#show ip eigrp 100 neighbors
EIGRP-IPv4 Neighbors for AS(100)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 4.4.4.1 Se3/3 11 00:05:26 61 366 0 12
0 1.1.1.2 Se3/0 12 00:07:29 75 450 0 20
R1#show ip route eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
D 2.0.0.0/8 [90/2681856] via 1.1.1.2, 00:05:39, Serial3/0
D 3.0.0.0/8 [90/2681856] via 4.4.4.1, 00:05:39, Serial3/3
D 5.0.0.0/8 [90/2681856] via 1.1.1.2, 00:07:13, Serial3/0
D 20.0.0.0/8 [90/2172416] via 1.1.1.2, 00:07:31, Serial3/0
D 30.0.0.0/8 [90/2684416] via 4.4.4.1, 00:05:39, Serial3/3
[90/2684416] via 1.1.1.2, 00:05:39, Serial3/0
D 40.0.0.0/8 [90/2172416] via 4.4.4.1, 00:05:33, Serial3/3
D 50.0.0.0/8 [90/2684416] via 1.1.1.2, 00:04:06, Serial3/0
R2#show ip eigrp neighbors
EIGRP-IPv4 Neighbors for AS(100)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
2 5.5.5.1 Se3/5 11 00:04:52 40 240 0 4
1 2.2.2.2 Se3/1 14 00:07:14 68 408 0 14
0 1.1.1.1 Se3/0 12 00:08:24 80 480 0 15
R2#show ip route eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
D 3.0.0.0/8 [90/2681856] via 2.2.2.2, 00:06:31, Serial3/1
D 4.0.0.0/8 [90/2681856] via 1.1.1.1, 00:06:31, Serial3/0
D 10.0.0.0/8 [90/2172416] via 1.1.1.1, 00:08:33, Serial3/0
D 30.0.0.0/8 [90/2172416] via 2.2.2.2, 00:07:14, Serial3/1
D 40.0.0.0/8 [90/2684416] via 2.2.2.2, 00:06:25, Serial3/1
[90/2684416] via 1.1.1.1, 00:06:25, Serial3/0
D 50.0.0.0/8 [90/2172416] via 5.5.5.1, 00:04:58, Serial3/5
R3#show ip eigrp neighbors
EIGRP-IPv4 Neighbors for AS(100)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 3.3.3.2 Se3/2 13 00:07:08 74 444 0 11
0 2.2.2.1 Se3/1 11 00:07:58 76 456 0 21
R3#show ip route eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
D 1.0.0.0/8 [90/2681856] via 2.2.2.1, 00:07:11, Serial3/1
D 4.0.0.0/8 [90/2681856] via 3.3.3.2, 00:07:11, Serial3/2
D 5.0.0.0/8 [90/2681856] via 2.2.2.1, 00:08:04, Serial3/1
D 10.0.0.0/8 [90/2684416] via 3.3.3.2, 00:07:11, Serial3/2
[90/2684416] via 2.2.2.1, 00:07:11, Serial3/1
D 20.0.0.0/8 [90/2172416] via 2.2.2.1, 00:08:04, Serial3/1
D 40.0.0.0/8 [90/2172416] via 3.3.3.2, 00:07:05, Serial3/2
D 50.0.0.0/8 [90/2684416] via 2.2.2.1, 00:05:38, Serial3/1
R4#show ip eigrp neighbors
EIGRP-IPv4 Neighbors for AS(100)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 4.4.4.2 Se3/3 12 00:07:58 99 594 0 14
0 3.3.3.1 Se3/2 13 00:08:02 78 468 0 15
R4#show ip route eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
D 1.0.0.0/8 [90/2681856] via 4.4.4.2, 00:08:07, Serial3/3
D 2.0.0.0/8 [90/2681856] via 3.3.3.1, 00:08:07, Serial3/2
D 5.0.0.0/8 [90/3193856] via 4.4.4.2, 00:08:07, Serial3/3
[90/3193856] via 3.3.3.1, 00:08:07, Serial3/2
D 10.0.0.0/8 [90/2172416] via 4.4.4.2, 00:08:07, Serial3/3
D 20.0.0.0/8 [90/2684416] via 4.4.4.2, 00:08:07, Serial3/3
[90/2684416] via 3.3.3.1, 00:08:07, Serial3/2
D 30.0.0.0/8 [90/2172416] via 3.3.3.1, 00:08:07, Serial3/2
D 50.0.0.0/8 [90/3196416] via 4.4.4.2, 00:06:34, Serial3/3
[90/3196416] via 3.3.3.1, 00:06:34, Serial3/2
R5#show ip eigrp neighbors
EIGRP-IPv4 Neighbors for AS(100)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 5.5.5.2 Se3/5 11 00:07:11 46 276 0 19
R5#show ip route eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
D 1.0.0.0/8 [90/2681856] via 5.5.5.2, 00:07:21, Serial3/5
D 2.0.0.0/8 [90/2681856] via 5.5.5.2, 00:07:21, Serial3/5
D 3.0.0.0/8 [90/3193856] via 5.5.5.2, 00:07:21, Serial3/5
D 4.0.0.0/8 [90/3193856] via 5.5.5.2, 00:07:21, Serial3/5
D 10.0.0.0/8 [90/2684416] via 5.5.5.2, 00:07:21, Serial3/5
D 20.0.0.0/8 [90/2172416] via 5.5.5.2, 00:07:21, Serial3/5
D 30.0.0.0/8 [90/2684416] via 5.5.5.2, 00:07:21, Serial3/5
D 40.0.0.0/8 [90/3196416] via 5.5.5.2, 00:07:21, Serial3/5
R1(config)#ip multicast-routing
R1(config)#interface serial 3/0
R1(config-if)#ip pim dense-mode
R1(config)#interface serial 3/3
R1(config-if)#ip pim dense-mode
R1(config-if)#int f0/0
R1(config-if)#ip pim dense-mode
*Oct 12 04:42:13.507: %PIM-5-DRCHG: DR change from neighbor 0.0.0.0 to 10.1.1.1 on interface FastEthernet0/0
*Oct 12 04:42:43.595: %PIM-5-NBRCHG: neighbor 1.1.1.2 UP on interface Serial3/0
*Oct 12 04:50:27.739: %PIM-5-NBRCHG: neighbor 4.4.4.1 UP on interface Serial3/3
R1(config-if)#exit
R2(config)#ip multicast-routing
R2(config)#int serial 3/0
R2(config-if)#ip pim dense-mode
*Oct 12 04:42:43.755: %PIM-5-NBRCHG: neighbor 1.1.1.1 UP on interface Serial3/0
R2(config)#interface serial 3/1
R2(config-if)#ip pim dense-mode
R2(config)#interface serial 3/5
R2(config-if)#ip pim dense-mode
R2(config-if)#interface f0/0
R2(config-if)#interface f0/0
R2(config-if)#ip pim dense-mode
*Oct 12 04:44:12.411: %PIM-5-DRCHG: DR change from neighbor 0.0.0.0 to 20.1.1.1 on interface FastEthernet0/0
*Oct 12 04:49:10.347: %PIM-5-NBRCHG: neighbor 2.2.2.2 UP on interface Serial3/1
R2(config-if)#exit
R3(config)#ip multicast-routing
R3(config)#interface f0/0
R3(config-if)#ip pim dense-mode
*Oct 12 04:48:44.135: %PIM-5-DRCHG: DR change from neighbor 0.0.0.0 to 30.1.1.1 on interface FastEthernet0/0
R3(config-if)#int serial 3/1
R3(config-if)#ip pim dense-mode
*Oct 12 04:49:10.063: %PIM-5-NBRCHG: neighbor 2.2.2.1 UP on interface Serial3/1
R3(config-if)#int serial 3/2
R3(config-if)#ip pim dense-mode
*Oct 12 04:50:17.187: %PIM-5-NBRCHG: neighbor 3.3.3.2 UP on interface Serial3/2
R3(config-if)#exit
R4(config)#ip multicast-routing
R4(config)#int f0/0
R4(config-if)#ip pim dense-mode
*Oct 12 04:50:01.915: %PIM-5-DRCHG: DR change from neighbor 0.0.0.0 to 40.1.1.1 on interface FastEthernet0/0
R4(config-if)#int s3/2
R4(config-if)#ip pim dense-mode
*Oct 12 04:50:17.539: %PIM-5-NBRCHG: neighbor 3.3.3.1 UP on interface Serial3/2
R4(config-if)#int se3/3
R4(config-if)#ip pim dense-mode
*Oct 12 04:50:27.947: %PIM-5-NBRCHG: neighbor 4.4.4.2 UP on interface Serial3/3
R4(config-if)#exit
R5(config)#ip multicast-routing
R5(config)#int se3/5
R5(config-if)#ip pim dense-mode
*Oct 12 04:52:52.875: %PIM-5-NBRCHG: neighbor 5.5.5.2 UP on interface Serial3/5
R5(config-if)#int f0/0
R5(config-if)#ip pim dense-mode
R5(config-if)#exit
*Oct 12 04:53:14.715: %PIM-5-DRCHG: DR change from neighbor 0.0.0.0 to 50.1.1.1 on interface FastEthernet0/0
R1#show ip pim interface
Address Interface Ver/ Nbr Query DR DR
Mode Count Intvl Prior
1.1.1.1 Serial3/0 v2/D 1 30 1 0.0.0.0
4.4.4.2 Serial3/3 v2/D 1 30 1 0.0.0.0
10.1.1.1 FastEthernet0/0 v2/D 0 30 1 10.1.1.1
R1#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
Neighbor Interface Uptime/Expires Ver DR
Address Prio/Mode
1.1.1.2 Serial3/0 00:18:24/00:01:31 v2 1 / S P G
4.4.4.1 Serial3/3 00:10:40/00:01:24 v2 1 / S P G
R2#show ip pim interface
Address Interface Ver/ Nbr Query DR DR
Mode Count Intvl Prior
1.1.1.2 Serial3/0 v2/D 1 30 1 0.0.0.0
2.2.2.1 Serial3/1 v2/D 1 30 1 0.0.0.0
5.5.5.2 Serial3/5 v2/D 1 30 1 0.0.0.0
20.1.1.1 FastEthernet0/0 v2/D 0 30 1 20.1.1.1
R2#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
Neighbor Interface Uptime/Expires Ver DR
Address Prio/Mode
1.1.1.1 Serial3/0 00:19:31/00:01:24 v2 1 / S P G
2.2.2.2 Serial3/1 00:13:04/00:01:26 v2 1 / S P G
5.5.5.1 Serial3/5 00:09:22/00:01:43 v2 1 / S P G
R3#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
Neighbor Interface Uptime/Expires Ver DR
Address Prio/Mode
2.2.2.1 Serial3/1 00:13:36/00:01:25 v2 1 / S P G
3.3.3.2 Serial3/2 00:12:29/00:01:33 v2 1 / S P G
R3#show ip pim interface
Address Interface Ver/ Nbr Query DR DR
Mode Count Intvl Prior
30.1.1.1 FastEthernet0/0 v2/D 0 30 1 30.1.1.1
2.2.2.2 Serial3/1 v2/D 1 30 1 0.0.0.0
3.3.3.1 Serial3/2 v2/D 1 30 1 0.0.0.0
R4#show ip pim interface
Address Interface Ver/ Nbr Query DR DR
Mode Count Intvl Prior
40.1.1.1 FastEthernet0/0 v2/D 0 30 1 40.1.1.1
3.3.3.2 Serial3/2 v2/D 1 30 1 0.0.0.0
4.4.4.1 Serial3/3 v2/D 1 30 1 0.0.0.0
R4#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
Neighbor Interface Uptime/Expires Ver DR
Address Prio/Mode
3.3.3.1 Serial3/2 00:13:24/00:01:37 v2 1 / S P G
4.4.4.2 Serial3/3 00:13:14/00:01:15 v2 1 / S P G
R5#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
Neighbor Interface Uptime/Expires Ver DR
Address Prio/Mode
5.5.5.2 Serial3/5 00:11:22/00:01:40 v2 1 / S P G
R5#show ip pim interface
Address Interface Ver/ Nbr Query DR DR
Mode Count Intvl Prior
5.5.5.1 Serial3/5 v2/D 1 30 1 0.0.0.0
50.1.1.1 FastEthernet0/0 v2/D 0 30 1 50.1.1.1
R5#show ip igmp group
IGMP Connected Group Membership
Group Address Interface Uptime Expires Last Reporter Group Accounted
224.0.1.40 Serial3/5 00:12:24 stopped 5.5.5.1
(During testing and in the absence of IGMP-capable recipients
we have to manually configure multicast group membership on a router interface.
IOS provides command to designate group membership on an interface. The join-group
command makes the router behave as a member of the specified group)
R5(config)#interface fastEthernet 0/0
R5(config-if)#ip igmp join-group 224.5.5.5
R5(config-if)#end
R5#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,
Q - Received BGP S-A Route, q - Sent BGP S-A Route,
V - RD & Vector, v - Vector
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 224.5.5.5), 00:02:49/00:02:49, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
FastEthernet0/0, Forward/Dense, 00:02:49/stopped
Serial3/5, Forward/Dense, 00:02:49/stopped
(*, 224.0.1.40), 00:20:32/stopped, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial3/5, Forward/Dense, 00:20:32/stopped
R1#ping 224.5.5.5 repeat 5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 224.5.5.5, timeout is 2 seconds:
Reply to request 0 from 50.1.1.1, 140 ms
Reply to request 1 from 50.1.1.1, 148 ms
Reply to request 2 from 50.1.1.1, 144 ms
Reply to request 3 from 50.1.1.1, 184 ms
Reply to request 4 from 50.1.1.1, 112 ms
R2#ping 224.5.5.5 repeat 5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 224.5.5.5, timeout is 2 seconds:
Reply to request 0 from 50.1.1.1, 128 ms
Reply to request 1 from 50.1.1.1, 36 ms
Reply to request 2 from 50.1.1.1, 44 ms
Reply to request 3 from 50.1.1.1, 84 ms
Reply to request 4 from 50.1.1.1, 76 ms
R3#ping 224.5.5.5 repeat 5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 224.5.5.5, timeout is 2 seconds:
Reply to request 0 from 50.1.1.1, 240 ms
Reply to request 1 from 50.1.1.1, 64 ms
Reply to request 2 from 50.1.1.1, 64 ms
Reply to request 3 from 50.1.1.1, 156 ms
Reply to request 4 from 50.1.1.1, 128 ms
R4#ping 224.5.5.5 repeat 5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 224.5.5.5, timeout is 2 seconds:
Reply to request 0 from 50.1.1.1, 300 ms
Reply to request 0 from 50.1.1.1, 476 ms
Reply to request 1 from 50.1.1.1, 272 ms
Reply to request 1 from 50.1.1.1, 272 ms
Reply to request 2 from 50.1.1.1, 180 ms
Reply to request 2 from 50.1.1.1, 184 ms
Reply to request 3 from 50.1.1.1, 180 ms
Reply to request 3 from 50.1.1.1, 192 ms
Reply to request 4 from 50.1.1.1, 116 ms
Reply to request 4 from 50.1.1.1, 116 ms
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