219
No SA entries in the switch’s SA cache
Symptom
MSDP fails to send (S, G) entries through SA messages.
Analysis
•
The
import-source
command controls sending (S, G) entries through SA messages to MSDP peers. If
this command is executed without the
acl-number
argument, all the (S, G) entries will be filtered off.
That is, no (S, G) entries of the local domain will be advertised.
•
If the
import-source
command is not executed, the system will advertise all the (S, G) entries of the
local domain. If MSDP fails to send (S, G) entries through SA messages, check whether the
import-
source
command has been correctly configured.
Solution
1.
Verify that a route is available between the devices. Use the
display ip routing-table
command to
determine whether the unicast route between the devices is correct.
2.
Verify that a unicast route is available between the two devices that will become MSDP peers to
each other.
3.
Evaluate the configuration of the
import-source
command and its
acl-number
argument and be sure
that the ACL rule can filter appropriate (S, G) entries.
Inter-RP communication faults in Anycast RP application
Symptom
RPs fail to exchange their locally registered (S, G) entries with one another in the Anycast RP
application.
Analysis
•
In the Anycast RP application, RPs in the same PIM-SM domain are configured to be MSDP peers to
achieve load balancing among the RPs.
•
An MSDP peer address must be different from the Anycast RP address, and the C-BSR and C-RP
must be configured on different devices or interfaces.
•
If the
originating-rp
command is executed, MSDP will replace the RP address in the SA messages
with the address of the interface specified in the command.
•
When an MSDP peer receives an SA message, it performs RPF check on the message. If the MSDP
peer finds that the remote RP address is the same as the local RP address, it will discard the SA
message.
Solution
1.
Verify that a route is available between the devices. Use the
display ip routing-table
command to
determine whether the unicast route between the devices is correct.
2.
Verify that a unicast route is available between the two devices that will become MSDP peer to
each other.
3.
Evaluate the configuration of the
originating-rp
command. In the Anycast RP application
environment, be sure to use the
originating-rp
command to configure the RP address in the SA
messages, which must be the local interface address.
4.
Verify that the C-BSR address is different from the Anycast RP address.
Содержание A5500 EI Switch Series
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