Brocade Unified IP MIB Reference (Supporting FastIron Releases 07.5.00 and 08.0.10) - Manual (Page 269)

Unified IP MIB Reference 243
53-1003106-01
Chapter
14
Trace route group
In this chapter
• Trace route group. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
• General trace route group. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
• Trace route result table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
• IP forwarding cache table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245
• IP AS-Path access list table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246
• IP community list table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247
• IP prefix list table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248
• IP AS-Path access list string table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250
• IP community list string table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250
Trace route group
This group uses the following method to detect routes used to reach a destination address.
1. The originating Layer 3 Switch sends a probe packet (a UDP packet) to the destination address
with a time-to-live (TTL) value of 1.
2. The first Layer 3 Switch that receives this packet decrements the TTL, then drops the packet
and returns a ICMP packet to the originator.
3. The originating Layer 3 Switch records the route in the “snRtIpTraceRouteResultTable” .
4. The originating Layer 3 Switch sends a probe packet (a UDP packet) to the destination address
with a TTL value of 2.
5. The second Layer 3 Switch that receives this packet decrements the TTL, then drops the
packet and returns an ICMP packet to the originator.
6. The originating Layer 3 Switch records the route in “snRtIpTraceRouteResultTable” .
This procedure is repeated until the destination is reached or the maximum TTL is reached.
General trace route group
The following objects define the trace route probe packet.