Network 3 Using Bootstrap Routers

Network 3  Using Bootstrap Routers

BSR-RP  Router Configurations

Router BSR1

hostname BSR1

ip multicast-routing

interface Ethernet 0

ip address 172.16.1.1 255.255.255.0

ip pim sparse-mode

interface Serial 0

ip address 172.16.2.1 255.255.255.0

ip pim sparse-mode

clock rate 1540000

interface Serial 1

ip address 172.16.3.1 255.255.255.0

ip pim sparse-mode

clock rate 1540000

router eigrp 100

network 172.16.0.0

ip pim bsr-candidate serial 0 24 8

Router RP1

hostname RP1

ip multicast-routing

interface Ethernet 0

ip address 172.16.4.1 255.255.255.0

ip pim sparse-mode

interface Serial 1

ip address 172.16.3.2 255.255.255.0

ip pim sparse-mode

router eigrp 100

network 172.16.0.0

ip pim rp-candidate ethernet 0

Router BSR2

hostname BSR2

ip multicast-routing

interface Ethernet 0

ip address 172.16.4.2 255.255.255.0

ip pim sparse-mode

interface Serial 1

ip address 172.16.5.2 255.255.255.0

ip pim sparse-mode

clock rate 1540000

router eigrp 100

network 172.16.0.0

ip pim bsr-candidate ethernet 0 24 8

Router RP2

hostname RP2

ip multicast-routing

interface Serial 0

ip address 172.16.2.2 255.255.255.0

ip pim sparse-mode

interface Serial 1

ip address 172.16.5.1 255.255.255.0

ip pim sparse-mode

router eigrp 100

network 172.16.0.0

ip pim rp-candidate serial 0

Two candidate Bootstrap routers have been configured in the network of Figure 7-36. Router BSR2 should be elected for this because its IP address is higher than BSR2. To view the BSR, use the show ip pim bsr command.

Figure 7-36: PIM-SM RP selection using Bootstrap routers.

rp1ashow ip pim bsr-router

PIMv2 Bootstrap information

BSR address:172.16.4.2 (?)

Uptime:00:06:46, BSR Priority: 8, Hash mask length: 24

Expires:00:01:43

Next Cand_RP_advertisement in 00:00:35

RP: 172.16.5.1(Serial0)

PIM-SM Bootstrap Border Router  A PIM-SM network can be divided into regions that are serviced by a regional Bootstrap router. Bootstrap messages can then be confined to a region by configuring a border router that does not allow Bootstrap messages from passing through the router, but the router will forward all other PIM traffic. The interface command used to configure a Bootstrap border router is

ip pim border

An example of the use of the border command is shown in Figure 7-37.

Figure 7-37: PIM-SM Bootstrap border router

Border Configuration

interface Serial 0

ip pim sparse-mode

ip pim border

interface Serial 1

ip pim sparse-mode

ip pim border

References

RFC 2362, “Protocol Independent Multicast-Sparse Mode (PIM-SM): Protocol Specification,” D. Estrin, D. Farinacci, A. Helmy, D. Thaler, S. Deering, M. Handley, V. Jacobson, C. Liu, P. Sharma, L. Wei, 1998

RFC 2117, “Protocol Independent Multicast-Sparse Mode (PIM-SM): Protocol Specification,” D. Estrin, D. Farinacci, A. Helmy, D. Thaler, S. Deering, M. Handley, V. Jacobson, C. Liu, P. Sharma, L. Wei, 1997 cp8