H3C Technologies H3C Intelligent Management Center - Manual (Page 245)

deleted, the LSR sends a Notification message to terminate the LDP session. The Hello timer
value ranges from 1 to 65535 seconds.
• MD5 Authentication—To improve the security of LDP sessions, you can configure MD5
authentication for the underlying TCP connections, so that the TCP connections can be
established only if the peers have the same authentication password. Values include: Disable
and Enable. If you select Enable, the password text box appears.
• Label Advertisement Mode—Only the Downstream Unsolicited (DU) mode is supported. In
this mode, an LSR automatically assigns a label to an FEC and then distributes the FEC-label
binding to its upstream LSR.
• Peer Path Vector Length—Maximum number of hops of an LSP contained in a label request
message or label mapping message. An LSR terminates the establishment of an LSP when the
hop count of the path, or the length of the path vector, reaches the upper limit.
NOTE:
The Advanced Configuration option is available for a pair of peers only when the peer Status is Normal
and the Session Status is Operational. Otherwise, you can only view the peer details.
Viewing session information
LDP sessions are established between LSRs based on TCP connections and used to exchange messages
for label binding, label releasing, and error notification. This viewing function enables you to view the
session information and configuration of a pair of LDP peers.
To view session information:
1. Click Service > MPLS Management > LDP Management from the tabular navigation system on the
top of the IMC main page.
2. Locate and click the Operation icon of a pair of LDP peers, and then select Session
Information from the operation menu.
3. You can view the following parameters in the Session Information page:
• Local LSR ID—Indicates local LSR ID.
• Peer LSR ID—Indicates peer LSR ID.
• TCP Connection—Indicates the TCP connection based on which the LDP session is created.
• Session Status—Indicates session status. Values include: All, NonExistent, Initialized,
Open-Received, Open-Sent, and Operational.
• Local Device’s Role in Session—Indicates device role in session. Values include: Active and
Passive.
• Keepalive Timer (s)—Maximum time allowed for receiving an LDP PDU (one LDP PDU can
carry one or more LDP messages). When the timer expires, the LSR closes the TCP connection
and terminates the LDP session. The Keepalive timer value ranges from 1 to 65535 seconds.
• Hello Timer (s)—Maximum time an LSR waits for receiving a hello message. LDP peers
periodically send Hello messages to indicate that they intend to keep the Hello adjacency. If
an LSR does not receive any Hello message from a peer before the Hello timer expires, it
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