143 lines
4.2 KiB
Text
143 lines
4.2 KiB
Text
Core
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~~~~
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- route validation
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- fake multipath?
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- config file: symbolic constants?
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- counters (according to SNMP MIB?)
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- generation of subnet mask ICMP's for v6?
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- debugging dumps and protocol tracing!
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- unaligned accesses?
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RIP
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~~~
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- RIP: export-only and import-only mode?
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- drop RIPv1 (Historic protocol)?
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OSPF
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~~~~
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Almquist & Kastenholz [Page 111]
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RFC 1716 Towards Requirements for IP Routers November 1994
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7.2.2.2 Specific Issues
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Virtual Links
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There is a minor error in the specification that can cause
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routing loops when all of the following conditions are
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simultaneously true:
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(1) A virtual link is configured through a transit area,
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(2) Two separate paths exist, each having the same
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endpoints, but one utilizing only non-virtual
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backbone links, and the other using links in the
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transit area, and
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(3) The latter path is part of the (underlying physical
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representation of the) configured virtual link,
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routing loops may occur.
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To prevent this, an implementation of OSPF SHOULD invoke
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the calculation in Section 16.3 of [ROUTE:1] whenever any
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part of the path to the destination is a virtual link (the
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specification only says this is necessary when the first
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hop is a virtual link).
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BGP
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~~~
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- BGP:
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- in, local, out RIB
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- maxsize=4096
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- BGP identifier aka router id
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- removal of loops
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- aggregation, ATOMIC_AGGREGATE
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- communities
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- confederations
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- attributes must be sorted!
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- re-export of NEXT_HOP attribute
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- BGP session over currently down interface
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- route flap dampening?
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- LOCAL_PREF attribute
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- error notification received -> log error
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- set TTL to 1 (configurable?)
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- consulting IGP for next-hop information? (what if it changes?)
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- inter-advertisement delay???!
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- normalize (sort) incoming AS-SET's
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- maximum length of AS paths
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- expected neighbor AS
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- hold time
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- idle timer after error: initial value, exponential growth, maximum value
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- address testing macros (ALL_ZEROS)
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- all internal tables are in network order (?)
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- logging of errors and debug dumps
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- filter: logging of dropped routes (?)
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- limitation of memory consumption: per-process and total
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- alloca
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- precedence of all packets (incl. TCP)
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- adding of route: clear all bits not covered by masklen
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- switch: generate default route only if at least one BGP connection exists
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- route update: new, change, remove
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- route recalculation timing
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- CONFIG_TOS
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- CONFIG_MULTIPATH
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- reconfiguration without restart of all protocols?
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- change of interface address: ??? (down and up?)
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- "generate default route" switch for all IGP's
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- RIPv2:
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- Route Tag
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- limit routing table xfer (frequency, only to neighbors)
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- multicast on/off
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- remember routes for all neighbors?
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- BGP:
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- import of IGP routes (use external route tags from OSPF)
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- Interface:
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- RIP metric
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- multicast capability flag
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- MTU
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- OSPF metrics (per-TOS)
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- running protocol on an interface:
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- interface is not required to exist
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- can specify a wildcard pattern or an interface list
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- preferences:
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- directly connected
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- static
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- OSPF internal, OSPF ext type 1 (comparable metrics), OSPF inter-area
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- RIP
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- BGP
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- OSPF ext type 2
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- sink
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- lib:
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- MD5
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- OSPF:
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- Dijkstra: use Fibonacci heaps?
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- point-to-point interface with address: advertise as stub network
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- static routes: stub networks?
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- modes: PtP, PtP-unnumbered, Broadcast, NBMA, point-to-multipoint
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- importing of device routes for networks where we don't run OSPF
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- tie breaking for equal type 2 ext metrics by using internal (type 1) metric
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- SPF tree recalc timing (per-area timers?)
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- aggregation: specify network list for each area
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- stub area: either no external routes or only default route
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- automatic generation of external route tags (RFC1403) -- what about
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using the same rule for RIPv2? [shared code?]
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- timers - one-shot and periodic, resolution 1 sec, randomized
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- re-configuration: restart of routing protocols (shutdown mode)
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- route: originating AS
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- Check incoming packets and log errors!!
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