CCIE Pursuit Blog

April 5, 2008

Internetwork Expert Volume II: Lab 6 – Section 5

IP Multicast – 8 Points

5.1  PIM

Easy task.  There is a typo in the task.  You need to configure pim dense-mode on sw1’s fa0/14 interface (not fa0/2).

Task 5.1 – typo error in the task description

5.2  PIM Filtering

Configure r1 so that it does not become a PIM neighbor with r5.  r5 should still allow clients on VLAN 5 to receive multicast traffic.

This is a case of multicast stub routing.  There is a very nice breakdown on this in the solution guide.  I’m still struggling with advanced multicast.  I need to take some time and review multicast.

Before:
r1(config)#do sh ip pim  neig
PIM Neighbor Table
Mode: B – Bidir Capable, DR – Designated Router, N – Default DR Priority,
      S – State Refresh Capable
Neighbor          Interface                Uptime/Expires    Ver   DR
Address                                                            Prio/Mode
191.1.125.5       Serial0/0                00:17:02/00:01:27 v2    1 / DR S
191.1.125.2       Serial0/0                00:18:55/00:01:32 v2    1 / S
191.1.13.3        Serial0/1                00:17:58/00:01:31 v2    1 / S

After:
*Mar  1 20:54:06.241: %PIM-5-NBRCHG: neighbor 191.1.125.5 DOWN on interface Serial0/0 DR
*Mar  1 20:54:06.241: %PIM-5-DRCHG: DR change from neighbor 191.1.125.5 to 191.1.125.2 on interface Serial0/0

r1(config-if)#do sh ip pim nei
PIM Neighbor Table
Mode: B – Bidir Capable, DR – Designated Router, N – Default DR Priority,
      S – State Refresh Capable
Neighbor          Interface                Uptime/Expires    Ver   DR
Address                                                            Prio/Mode
191.1.125.2       Serial0/0                00:20:49/00:01:37 v2    1 / DR S <-No more r5
191.1.13.3        Serial0/1                00:19:52/00:01:35 v2    1 / S

ip pim neighbor-filter

r5#sh ip igmp int fa0/0 | i help
  IGMP helper address is 191.1.125.1

ip igmp helper-address

5.3 IGMP

Configure VLAN 363 on r3 (fa0/0) to support IGMP version 1.

r3(config)#int fa0/0
r3(config-if)#ip igmp version 1

r3#sh ip igmp int fa0/0 | i ver
  Current IGMP host version is 1
  Current IGMP router version is 1

ip igmp version

5.4 Multicast Testing

Configure sw1 to forward traffic for multicast group 225.25.25.25 but do not allow sw1 to process switch this traffic.

ip igmp static-group

sw1(config)#int vlan 7
sw1(config-if)#ip igmp static-group 225.25.25.25

sw1#sh ip igmp group
IGMP Connected Group Membership
Group Address    Interface                Uptime    Expires   Last Reporter
225.25.25.25     Vlan7                00:00:25  stopped   0.0.0.0
224.0.1.40       FastEthernet0/14         00:39:18  00:02:30  191.1.27.2

sw1#sh ip multicast int vlan 7
Vlan7 is up, line protocol is up
  Internet address is 191.1.7.7/24
  Multicast routing: enabled
  Multicast switching: distributed   <-Should say process
  Multicast packets in/out: 0/0
  Multicast boundary: not set
  Multicast TTL threshold: 0
  Multicast Tagswitching: disabled

Hmmmmm…..I never could get my output to show process switching.  😦

task 5.4 process switching

 

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1 Comment »

  1. even the IE v5 book has the same output as urs. it says “distributed”

    Comment by M Khan — June 10, 2009 @ 4:41 pm | Reply


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