Hi,
I would like to ask some generic questions about ISIS configuration.
1. Is ISIS authentication part of good current practices in large backbone?
2. In the case of an Ethernet and STM backbone, that already has Frame Check
Sequence functionality, is it still necessary to enable checksum for IS-IS
packet? Is this option used only in case the L2 protocol does not provide any
FCS?
3. Let's imagine a network of 30 routers, 100 IS-IS routes within 20 PoPs.
Only the loopbacks, point-to-point links and backbone LAN will be advertised
within ISIS.
All the rest (Internet routes, Data centers'LAN, customers' pool of addresses,
customers LAN and connections from PE to CE) will be advertised by iBGP with
route-reflectors.
My intention is to have a big flat network, within a single area where all the
IS-IS enable interfaces will be Level2 only.
Whould you see any practical issue in this design?
4. About LDP/ISIS synchronisation:
Scenario1: we don't configure "ldp-synchronization {enable;}", my understanding
is that:
- 1. ISIS converges
- 2. Some IP traffic can routed on the backbone (excluding MPLS VPN and
Internet routes for example)
- 3. LDP converges, LSP are established
- 4. All Taffic is tagged switched
Scenario2: we do configure "ldp-synchronization {enable;}", my understanding is
that:
- 1. ISIS converges
- 2. No IP Traffic can be routed on the backbone as the links are advertised
with the maximum metric
- 3. LDP converges, LSP are established
- 4. All Taffic is tagged switched
Are those scenarii correct?
5. Concerning BFD (bidirectional forwarding detection), when Hellos are not
received anymore, is the interface status declared down? Or is it only the ISIS
adjacency that is torne down? What if the Hellos are blocked only in one
direction?
6. Given that our backbone is build over Metro-Ethernet and STM, can I safely
assume that the MTU can only be is symetrical? If not (why?) it becomes
necessary to configure some padding (strict maybe)
Thank you very much in advance for your time.
Christophe
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