as 32 LDP loopback interface work
HI guys
why we need dos interface loop so that / 32 mask LDP work
Thank you
Hello, Ibrahim.
LDP can also work with no/32 mask on telesignalisations but when the IGP's OSPF in a loopback configuration that must be
int loop0
IP ospf network point
Only in this way OSPF announces the subnet mask true of the loop. By default, OSPF recognizes a loopback and announced only a host 32 route.
However, the real reason why we use / 32 telesignalisations on networks of service providers is another and saving address space.
The only sense of the loopback address must represent the single node/p PE in the IGP and the MPLS network.
To host 32 channels are enough.
Also the use of 32 telesignalisations allow you to select a block of specific address for all current and future network nodes.
In large provider networks MPLS LDP is implemented with label filtering: This means that labels are allocated and announced only for loopback addresses (thanks to the fact that they are / 32 belonging to the same address space).
This is done for scalability, in order to avoid affecting MPLS labels to prefixes not loopback IP.
In these networks of suppliers all users associated prefixes either in a form of VPN (L3 or L2) or simply routed on the global routing table is announced by MP BGP internally.
By induction that the BGP next hop is solved by an LSP with a destination = distance PE loopback.
If indeed the ultimate reason to use 32 telesignalisations is scalability.
Hope to help
Giuseppe
Tags: Cisco Network
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===========
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!
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==================================================
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!
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!
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!
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end
====================
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====================================
Thank you very much in advance for your answer!
Kind regards
Aerts
Hi AEK.
the IP unnumbered command does not work on multiaccess-interfaces such as Ethernet (even when you set it up as a point-to-point OSPF):
Understand and configure the IP without order number
Cisco IOS IP Addressing Services Command Reference #ip unnumberd
HTH
Rolf
[EDIT]:
... apparently, with the exception of high range as the 6 k platforms:
Order history
(...)
12.2 (18) SXF: this command has been modified to support the physical Ethernet interfaces and switched virtual interfaces (LASS).
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