Shulou(Shulou.com)06/01 Report--

The first step is the establishment of msdp peer

1. Respective show run | s msdp

Check the configuration and make adjustments

If there is an error after connect-source

Then the original ip msdp sa-filterout will disappear.

Need to be replenished

2. Determine the two RP addresses

Ensure that the bottom layer is reachable

Bring the source Ping

3. Determine the interface where the rp address is located

If the RP address of multiple interfaces is the same, it will be determined in combination with the configuration.

4. Show ip msdp peer ensures that neighbors are established normally.

Step 2: the establishment of a shared tree

1. Check whether the local RP has established the corresponding (*, G)

R2#shwoip mroute

A, only (* 224.0.1.40) but followed by stopped

Check whether the local side has RP-related settings and query the local RP address on the peer MSDP peer.

And check the next router.

B, if it also has (*, group address) but with stopped

It also indicates that there is no relevant RP setting on the local side.

strategy

For pim protocol-respective group number auto: 224.0.1.39224.0.1.40

BSR: 224.0.0.13

C. if the table item is successful, check the next router

2. Find the next route from the RP to the client according to the topology

R2#shwoip mroute

Repeat the previous round, but make sure the bottom layer gets to the RP.

Know until you find the right item.

Or find the client.

3. Ensure that the DR of the source has the correct table item R6#showip pim interface

Show ip mroute

1 if not, check whether the source is grouped.

2 check whether pim is enabled on the corresponding interface

R6#showip pim interface

To determine the correct DR

Pay special attention to if the client is the loopback of the router

Or the SVI of the switch needs to add ip pim space-mode

4. Finally, determine whether the shared tree is established successfully on RP.

The third step is to establish the source tree.

1. Ping the group address at the source

A, RP show ip mroute on the local side

Check if there is (S * G)

1. If not, check the reachability from source to local source to RP address

Pay attention to check the incoming interface

2. Check whether the source has RP (add mapping dynamically)

Check the number of hops sent down by RP in dynamic mode.

The most important thing is to see if there is any. thirty-nine. If there is no mroute in 40%, there is no multicast.

B, RP show ipmroute at the opposite end

Check if there is (S * G)

If not, check whether there are sa-filter settings on both ends.

If you have to check whether the incoming interface is correct

1. Check whether a normal neighbor relationship is established with the peer (preferred intermediate router for inspection)

And check the interface configuration to adjust. Note that neighbors need to be established under the interface verified by rpf.

If there is no ippim configuration on both lines, check the peer.

R2#show ip rpf 10.1.1.13

Failed, no route exists

2. Check that most of the edges of msdp are multicast according to the order of check.

Note whether their bgp multicast neighbors are established

If there is no mulicast, it is mostly unicast.

C, finally determine whether the peer has established the correct (S, * G)

D. Check whether the exit is correct on the local side.

If incorrect, check whether the intermediate router has multicast demarcation.

Pay special attention to whether there is a route to the source because when the later router changes from a shared tree to the shortest tree

Rpf check is required

2. Check the source tree establishment of the route after the peer RP in turn.

Until the client does not need to establish a source tree but requires a route with a source

3. Starting from the local RP, check the back routers in turn.

Show ip mroute

If it does not exist to check the neighbor

If the input interface is wrong

Then check the show iprpf source address

Adjust the interface of rpf verification

4. In the source ping group address

If it doesn't work,

Check whether there is a policy in turn

Generally speaking, the local RP usually has a policy before it.

Pay special attention to multicast (UDP) to unicast (ICMP), especially to the use of trance, which is generally not applicable.

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