Bidirectional shared trees use the same tree for traffic from sources towards RP and from RP to receivers
On each link, the router with the best path to the RP is elected to be the Designated Forwarder
The Designated Forwarder is responsible for forwarding upstream towards the RP
ROSH#
ROSH#sh run
Building configuration...
Current configuration : 1417 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname ROSH
!
boot-start-marker
boot-end-marker
!
!
ip subnet-zero
ip cef
!
!
no ip domain-lookup
!
ip multicast-routing
no mpls traffic-eng auto-bw timers frequency 0
call rsvp-sync
!
!
!
!
!
!
!
!
interface Loopback0
ip address 172.18.5.5 255.255.255.255
no clns route-cache
!
interface FastEthernet0/0
no ip address
shutdown
duplex half
no clns route-cache
!
interface FastEthernet1/0
ip address 172.18.25.5 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
no clns route-cache
!
interface FastEthernet1/1
ip address 10.255.1.2 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
standby 1 ip 10.255.1.1
standby 1 priority 105
standby 1 preempt
no clns route-cache
!
router ospf 1
log-adjacency-changes
network 10.255.1.2 0.0.0.0 area 0
network 172.18.5.5 0.0.0.0 area 0
network 172.18.25.5 0.0.0.0 area 0
!
ip classless
!
no ip http server
!
ip pim bidir-enable
ip pim autorp listener
!
!
no cdp run
!
!
!
control-plane
!
!
dial-peer cor custom
!
!
!
alias exec si show ip int brie
alias exec sr sh ip route
alias exec son show ip ospf neigh
alias exec vrf show ip vrf interface
alias exec sib show ip bgp vpnv4 all summ
alias exec srb sh run | b router bgp
!
line con 0
exec-timeout 0 0
logging synchronous
stopbits 1
line aux 0
stopbits 1
line vty 0 4
!
!
end
ROSH#
RISH#
RISH#sh run
Building configuration...
Current configuration : 1693 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname RISH
!
boot-start-marker
boot-end-marker
!
!
ip subnet-zero
ip cef
!
!
no ip domain-lookup
!
ip multicast-routing
no mpls traffic-eng auto-bw timers frequency 0
call rsvp-sync
!
!
!
!
!
!
!
!
interface Loopback0
ip address 172.18.1.1 255.255.255.255
ip pim sparse-mode
no clns route-cache
!
interface FastEthernet0/0
no ip address
shutdown
duplex half
no clns route-cache
!
interface FastEthernet1/0
ip address 172.18.31.1 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
!
interface FastEthernet1/1
ip address 172.18.12.3 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
no clns route-cache
!
interface FastEthernet2/0
ip address 10.255.1.3 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
standby 1 ip 10.255.1.1
standby 1 preempt
no clns route-cache
!
interface FastEthernet2/1
no ip address
shutdown
duplex auto
speed auto
no clns route-cache
!
router ospf 1
log-adjacency-changes
network 10.255.1.3 0.0.0.0 area 0
network 172.18.1.1 0.0.0.0 area 0
network 172.18.12.3 0.0.0.0 area 0
network 172.18.31.1 0.0.0.0 area 0
!
ip classless
!
no ip http server
!
ip pim bidir-enable
ip pim autorp listener
ip pim send-rp-discovery scope 10
!
!
no cdp run
!
!
!
control-plane
!
!
dial-peer cor custom
!
!
!
alias exec si show ip int brie
alias exec sr sh ip route
alias exec son show ip ospf neigh
alias exec vrf show ip vrf interface
alias exec sib show ip bgp vpnv4 all summ
alias exec srb sh run | b router bgp
!
line con 0
exec-timeout 0 0
logging synchronous
stopbits 1
line aux 0
stopbits 1
line vty 0 4
!
!
end
RISH#
PT#
PT#sh run
Building configuration...
Current configuration : 1465 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname PT
!
boot-start-marker
boot-end-marker
!
!
ip subnet-zero
ip cef
!
!
no ip domain-lookup
!
ip multicast-routing
no mpls traffic-eng auto-bw timers frequency 0
call rsvp-sync
!
!
!
!
!
!
!
!
interface Loopback0
ip address 172.18.3.3 255.255.255.255
ip pim sparse-mode
no clns route-cache
!
interface FastEthernet0/0
no ip address
shutdown
duplex half
no clns route-cache
!
interface FastEthernet1/0
ip address 172.18.43.3 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
no clns route-cache
!
interface FastEthernet1/1
ip address 172.18.31.3 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
no clns route-cache
!
router ospf 1
log-adjacency-changes
network 172.18.3.3 0.0.0.0 area 0
network 172.18.31.3 0.0.0.0 area 0
network 172.18.43.3 0.0.0.0 area 0
!
ip classless
!
no ip http server
!
ip pim bidir-enable
ip pim autorp listener
ip pim send-rp-announce Loopback0 scope 10 group-list 1 bidir
!
!
access-list 1 permit 239.0.0.0 0.255.255.255
!
!
!
control-plane
!
!
dial-peer cor custom
!
!
!
alias exec si show ip int brie
alias exec sr sh ip route
alias exec son show ip ospf neigh
alias exec vrf show ip vrf interface
alias exec sib show ip bgp vpnv4 all summ
alias exec srb sh run | b router bgp
!
line con 0
exec-timeout 0 0
logging synchronous
stopbits 1
line aux 0
stopbits 1
line vty 0 4
!
!
end
PT#
TA#
TA#
TA#
TA#
TA#sh run
Building configuration...
Current configuration : 1732 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname TA
!
boot-start-marker
boot-end-marker
!
!
ip subnet-zero
ip cef
!
!
no ip domain-lookup
!
ip multicast-routing
no mpls traffic-eng auto-bw timers frequency 0
call rsvp-sync
!
!
!
!
!
!
!
!
interface Loopback0
ip address 172.18.2.2 255.255.255.255
ip pim sparse-mode
no clns route-cache
!
interface FastEthernet0/0
no ip address
shutdown
duplex half
no clns route-cache
!
interface FastEthernet1/0
ip address 172.18.42.2 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
no clns route-cache
!
interface FastEthernet1/1
ip address 172.18.12.2 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
no clns route-cache
!
interface FastEthernet2/0
ip address 172.18.25.3 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
no clns route-cache
!
interface FastEthernet2/1
no ip address
shutdown
duplex auto
speed auto
no clns route-cache
!
router ospf 1
log-adjacency-changes
network 172.18.2.2 0.0.0.0 area 0
network 172.18.12.2 0.0.0.0 area 0
network 172.18.25.3 0.0.0.0 area 0
network 172.18.42.2 0.0.0.0 area 0
!
ip classless
!
no ip http server
!
ip pim bidir-enable
ip pim autorp listener
ip pim send-rp-announce Loopback0 scope 10 group-list 1 bidir
!
!
access-list 1 permit 239.0.0.0 0.255.255.255
!
!
!
control-plane
!
!
dial-peer cor custom
!
!
!
alias exec si show ip int brie
alias exec sr sh ip route
alias exec son show ip ospf neigh
alias exec vrf show ip vrf interface
alias exec sib show ip bgp vpnv4 all summ
alias exec srb sh run | b router bgp
!
line con 0
exec-timeout 0 0
logging synchronous
stopbits 1
line aux 0
stopbits 1
line vty 0 4
!
!
end
TA#
HFA#
HFA#sh run
Building configuration...
Current configuration : 1627 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname HFA
!
boot-start-marker
boot-end-marker
!
!
ip subnet-zero
ip cef
!
!
no ip domain-lookup
!
ip multicast-routing
no mpls traffic-eng auto-bw timers frequency 0
call rsvp-sync
!
!
!
!
!
!
!
!
interface Loopback0
ip address 172.18.4.4 255.255.255.255
no clns route-cache
!
interface FastEthernet0/0
no ip address
shutdown
duplex half
no clns route-cache
!
interface FastEthernet1/0
ip address 10.223.1.2 255.255.255.252
ip igmp join-group 239.8.1.1
duplex auto
speed auto
no clns route-cache
!
interface FastEthernet1/1
ip address 172.18.43.4 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
no clns route-cache
!
interface FastEthernet2/0
ip address 172.18.42.4 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
no clns route-cache
!
interface FastEthernet2/1
no ip address
shutdown
duplex auto
speed auto
no clns route-cache
!
router ospf 1
log-adjacency-changes
network 10.223.1.2 0.0.0.0 area 0
network 172.18.4.4 0.0.0.0 area 0
network 172.18.42.4 0.0.0.0 area 0
network 172.18.43.4 0.0.0.0 area 0
!
ip classless
!
no ip http server
!
ip pim bidir-enable
ip pim autorp listener
!
!
no cdp run
!
!
!
control-plane
!
!
dial-peer cor custom
!
!
!
alias exec si show ip int brie
alias exec sr sh ip route
alias exec son show ip ospf neigh
alias exec vrf show ip vrf interface
alias exec sib show ip bgp vpnv4 all summ
alias exec srb sh run | b router bgp
!
line con 0
exec-timeout 0 0
logging synchronous
stopbits 1
line aux 0
stopbits 1
line vty 0 4
!
!
end
HFA#
All Pim router Domin are enable the pim Bidir
using
ip pim bidir-enable command
PIM Bidir need a RP we use here a auto-rp
Every router link election the DF win base on the metric,by the Offer message on the link
ROSH#sh ip route 172.18.3.3
Routing entry for 172.18.3.3/32
Known via "ospf 1", distance 110, metric 3, type intra area
Last update from 10.255.1.3 on FastEthernet1/1, 10:23:18 ago
Routing Descriptor Blocks:
* 10.255.1.3, from 172.18.3.3, 10:23:18 ago, via FastEthernet1/1
Route metric is 3, traffic share count is 1
RISH#sh ip route 172.18.3.3
Routing entry for 172.18.3.3/32
Known via "ospf 1", distance 110, metric 2, type intra area
Last update from 172.18.31.3 on FastEthernet1/0, 10:23:51 ago
Routing Descriptor Blocks:
* 172.18.31.3, from 172.18.3.3, 10:23:51 ago, via FastEthernet1/0
Route metric is 2, traffic share count is 1
debug ip pim df
11:34:57: PIM(0): Receive DF Winner message from 10.255.1.3 on FastEthernet1/1 (Non-DF)
11:34:57: PIM(0): RP 172.18.3.3, pref 110, metric 2
11:34:57: PIM(0): Metric is better
debug ip pim df
11:35:02: PIM(0): Send v2 Winner on FastEthernet2/0 (DF) for RP 172.18.3.3
11:35:02: PIM(0): Sender 10.255.1.3, pref 110, metric 2
The show ip mroute output on HFA shown the (*,239.8.1.1) entry FastEthernet1/1 present in both incoming and outgoing interface list as Bidir-upstream. This is not possible in PIM-SM
HFA#sh ip mroute 239.8.1.1
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,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel
Y - Joined MDT-data group, y - Sending to MDT-data group
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 239.8.1.1), 00:00:42/00:02:59, RP 172.18.3.3, flags: BPL
Bidir-Upstream: FastEthernet1/1, RPF nbr 172.18.43.3
Outgoing interface list:
FastEthernet1/1, Bidir-Upstream/Sparse, 00:00:42/00:00:00
