Configuring the MSDP peer time to live threshold

Configure the time-to-live (TTL) threshold to limit which multicast data packets the router encapsulated in SA Messaged forwarded to an MSDP peer. The TTL limits the number of hops a packet can take before the router drops the packet. The router sends out SA Messages with encapsulated data only if TTL equals or exceeds the value you configure. If the TTL is lower than the value you configure, the router drops the data packet and forwards the SA Message without the encapsulated data.

Note

MSDP transmits encapsulated multicast data packets inside forwarded MSDP messages. If the received SA is an encapsulated SA, then the switch parses the TTL value of the encapsulated data and compares it against the configured value. If the configured value is less than or equal to the parsed value, then the switch forwards the encapsulated data along with the SA, otherwise the switch forwards the SA alone by stripping the encapsulate data. By default, MSDP forwards encapsulated data along with the SA message. MSDP does not forward the encapsulated data to the local receivers.

When MSDP generates SA messages for SPB sources, the local cache miss data cannot be encapsulated into the SA messages that are sent to the peers.

The switch supports forwarding SA messages with encapsulated data from sources to MSDP peers but not from MSDP peers to the receivers.

Procedure

In the navigation pane, expand Configuration > IP.
Click MSDP.
Click the Peers tab.
In the row for the peer, double-click the Md5AuthEnabled field, and then select true.
In the row for the peer, double-click the DataTtl field, and then type a value.
Click Apply.

Peers field descriptions

Use the data in the following table to use the Peers tab.


Name	Description
RemoteAddress	Shows the IP address of the remote MSDP peer.
State	Shows the state of the default peer. An MSDP node only accepts SA messages from an operational default peer. Only one default peer can be operational; the configured default peers provide redundancy.
AdminEnabled	Changes the peer status to administratively enable or disable a configured peer. The default value is disabled (false).
ClearPeer	Clears the TCP connection to the specified MSDP peer and resets all MSDP message counters. The default value is disabled (false).
ConnectRetryInterval	Specifies the connection retry period, in seconds, for this peer. The default value is 30 seconds.
HoldTimeConfigured	The default value is 75 seconds.
KeepAliveConfigured	Specifies the keepalive period, in seconds, configured for this MSDP speaker with this peer. If the value is 0 seconds, no periodic keepalive messages are sent to the peer after the MSDP connection is established. The default value is 60 seconds.
DataTtl	Specifies the time-to-live value, from 1–255. The default value is 1, which means that the router forwards all SA messages with encapsulated data.
InSAFilterEnabled	Activates the inbound SA filter for the peer.
InSAFilterRouteMapName	Specifies the name of the route map. If you configure the route map name, the filter accepts only the SA messages that meet the match criteria in the route map map-name with a permit keyword. If you do not configure the route map name, the system blocks all inbound SA messages from this peer.
OutSAFilterEnabled	Activates the outbound SA filter for the peer.
OutSAFilterRouteMapName	Specifies the name of the route map. If you configure the route map name, the filter sends only the SA messages that meet the match criteria in the route map map-name with a permit keyword. If you do not configure the route map name, the system blocks all outbound SA messages from this peer.
Description	Specifies the text description, up to 255 characters, for the peer.
SALimit	Specifies the maximum number of SA messages from an MSDP peer to keep in the SA cache. The valid values are from 0–6144; the default value is 6144.
Md5AuthEnabled	Activates MD5 authentication on the TCP connection between peers. The default is false.
Md5AuthPassword	Specifies a case-sensitive password, up to 80 characters, for MD5 authentication.
RemotePort	Shows the remote port for the TCP connection between the MSDP peers.
LocalPort	Shows the local port for the TCP connection between the MSDP peers.
OperEnabled	Shows the operational status of the peer.
RPFFailures	Shows the number of SA messages received from this peer that failed the Peer-RPF check. Discontinuities in the value of this counter can occur at reinitialization of the management system.
InSAs	Shows the number of MSDP SA messages received on this connection. Discontinuities in the value of this counter can occur at reinitialization of the management system.
OutSAs	Shows the number of MSDP SA messages sent on this connection. Discontinuities in the value of this counter can occur at reinitialization of the management system.
InSARequests	Shows the number of MSDP SA-Request messages received on this connection. Discontinuities in the value of this counter can occur at reinitialization of the management system.
OutSARequests	Shows the number of MSDP SA-Request messages sent on this connection. Discontinuities in the value of this counter can occur at reinitialization of the management system.
InSAResponses	Shows the number of MSDP SA-Response messages received on this connection. Discontinuities in the value of this counter can occur at reinitialization of the management system.
OutSAResponses	Shows the number of MSDP SA-Response messages sent on this connection. Discontinuities in the value of this counter can occur at reinitialization of the management system.
InControlMessages	Shows the total number of MSDP messages received on this TCP connection. Discontinuities in the value of this counter can occur at reinitialization of the management system.
OutControlMessages	Shows the total number of MSDP messages transmitted on this TCP connection. Discontinuities in the value of this counter can occur at reinitialization of the management system.
InDataPackets	Shows the total number of encapsulated packets received on this TCP connection. Discontinuities in the value of this counter can occur at reinitialization of the management system.
OutDataPackets	Shows the total number of encapsulated packets transmitted on this TCP connection. Discontinuities in the value of this counter can occur at reinitialization of the management system.
FsmEstablishedTransitions	Shows the total number of times the BGP transitioned to the established state.
FsmEstablishedTime	Shows the time when the peer transitioned to the established state.
InMessageTime	Shows the time when the last MSDP message was received from the peer.
ConnectionAttempts	Shows the number of times the state machine has transitioned from inactive to connecting.
DiscontinuityTime	Shows the sysUpTime value (the time, in hundredths of a second, since the network management portion of the system last reinitialized) when one or more of the counters for this entry suffered a discontinuity. Discontinuities can occur at peer connection establishment. If no discontinuities occurred since the last reinitialization of the local management subsystem, the value is zero.
AsNumber	Specifies the autonomous system number of the MSDP peer. A peer can appear to be in another autonomous system (other than the one in which it really resides) if you use an MSDP peering session but do not use a Border Gateway Protocol peer session with that peer. If another autonomous system injects the prefix of the peer, the system displays the prefix as the autonomous system number of the peer.
TooShortMessages	Shows the number of short messages received from this peer.
InBadMessages	Shows the number of bad MSDP messages received from this peer.
InKeepAliveMessages	Shows the number of keepalive messages received from this peer.
OutKeepAliveMessages	Shows the number of keepalive messages transmitted to this peer.
SAsLearnedFromThisPeer	Shows the total number of SAs learned from this peer.
SAsAdvertisedToThisPeer	Shows the total number of SAs advertised from this peer.
UpOrDownTime	Shows the duration a peer has been up or down.
ConnAndStatsClearedTime	Shows the duration of connection and statistics cleared.