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ExtremeWare 7.7 Command Reference Guide
MPLS Commands—BlackDiamond Switch Only
configure mpls propagate-ip-ttl
configure mpls propagate-ip-ttl [enabled | disabled]
Description
Enables or disables the propagation of the IP time-to-live (TTL) field for routed IP packets. When
propagation is enabled, each LSR is viewed as a router hop from an IP TTL perspective. When
propagation is disabled, the LSP is viewed as a point-to-point link between the ingress LSR and the
egress LSR.
Syntax Description
This command has no arguments or variables.
Default
N/A
Usage Guidelines
This command enables and disables the propagation of the IP TTL value for routed IP packets. The
default setting is enabled.
NOTE
You must maintain identical
propagate-ip-ttl
settings on all LERs in the MPLS domain. Not doing so
may cause packets to loop endlessly and not be purged from the network if a routing loop is
inadvertently introduced.
When
propagate-ip-ttl
is disabled, the LSP is viewed as a point-to-point link between the ingress
LSR and the egress LSR. Intermediate LSRs in the MPLS network are not viewed as router hops (from
an IP TTL perspective). In this case, the IP TTL is decremented once by the ingress LSR and once by the
egress LSR. When disabled, the MPLS TTL is set to 255 by the ingress LSR and is independent of the IP
TTL.
When
propagate-ip-ttl
is enabled, each LSR is viewed as a router hop (from an IP TTL perspective).
When a packet traverses an LSP, it emerges with the same TTL value that it would have had if it had
traversed the same sequence of routers without being label-switched. When enabled, the MPLS TTL
field is initially set to the IP TTL field at the ingress LSR, and the IP TTL field is set to the MPLS TTL by
the egress LSR.
Example
The following command enables the propagation of the IP time-to-live (TTL) field for routed IP packets:
configure mpls propagate-ip-ttl enabled
History
This command was first available in an ExtremeWare IP Technology Services Release based on
v6.1.8b12.
Содержание ExtremeWare 7.7
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Страница 1481: ...show eaps ExtremeWare 7 7 Command Reference Guide 1481 Platform Availability This command is available on all platforms ...
Страница 1484: ...1484 ExtremeWare 7 7 Command Reference Guide EAPS Commands Platform Availability This command is available on all platforms ...
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Страница 1538: ...1538 ExtremeWare 7 7 Command Reference Guide ESRP Commands Platform Availability This command is available on all platforms ...
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Страница 1614: ...1614 ExtremeWare 7 7 Command Reference Guide STP Commands Platform Availability This command is available on all platforms ...
Страница 1621: ...enable stpd ports ExtremeWare 7 7 Command Reference Guide 1621 Platform Availability This command is available on all platforms ...
Страница 1774: ...1774 ExtremeWare 7 7 Command Reference Guide IP Unicast Commands ...
Страница 1824: ...1824 ExtremeWare 7 7 Command Reference Guide IGP Commands Platform Availability This command is available on all platforms ...
Страница 1884: ...1884 ExtremeWare 7 7 Command Reference Guide IGP Commands Platform Availability This command is available on all platforms ...
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Страница 2140: ...2140 ExtremeWare 7 7 Command Reference Guide IPX Commands i Series Platforms Only ...
Страница 2156: ...2156 ExtremeWare 7 7 Command Reference Guide ARM Commands BlackDiamond Switch Only ...
Страница 2168: ...2168 ExtremeWare 7 7 Command Reference Guide Remote Connect Commands ...
Страница 2180: ...2180 ExtremeWare 7 7 Command Reference Guide ATM Commands BlackDiamond 6800 Series Platforms Only ...
Страница 2236: ...2236 ExtremeWare 7 7 Command Reference Guide T1 E1 and T3 WAN Commands Alpine 3800 Series Platforms ...
Страница 2346: ...2346 ExtremeWare 7 7 Command Reference Guide PoS Commands BlackDiamond Switch Only ...
Страница 2410: ...2410 ExtremeWare 7 7 Command Reference Guide Power Over Ethernet Commands Summit 300 and 400 24p Switches and Alpine PoE Module ...
Страница 2446: ...2446 ExtremeWare 7 7 Command Reference Guide LLDP Commands ...
Страница 2496: ...2496 ExtremeWare 7 7 Command Reference Guide H VPLS Commands BlackDiamond Switch Only ...
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