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Diffstat (limited to 'TODO')
| -rw-r--r-- | TODO | 143 |
1 files changed, 143 insertions, 0 deletions
@@ -0,0 +1,143 @@ +Core +~~~~ +- route validation +- fake multipath? +- config file: symbolic constants? +- counters (according to SNMP MIB?) +- generation of subnet mask ICMP's for v6? +- debugging dumps and protocol tracing! +- unaligned accesses? + + +RIP +~~~ +- RIP: export-only and import-only mode? +- drop RIPv1 (Historic protocol)? + +OSPF +~~~~ + +Almquist & Kastenholz [Page 111] +RFC 1716 Towards Requirements for IP Routers November 1994 + + +7.2.2.2 Specific Issues + + Virtual Links + + There is a minor error in the specification that can cause + routing loops when all of the following conditions are + simultaneously true: + + (1) A virtual link is configured through a transit area, + + (2) Two separate paths exist, each having the same + endpoints, but one utilizing only non-virtual + backbone links, and the other using links in the + transit area, and + + (3) The latter path is part of the (underlying physical + representation of the) configured virtual link, + routing loops may occur. + + To prevent this, an implementation of OSPF SHOULD invoke + the calculation in Section 16.3 of [ROUTE:1] whenever any + part of the path to the destination is a virtual link (the + specification only says this is necessary when the first + hop is a virtual link). + +BGP +~~~ +- BGP: + - in, local, out RIB + - maxsize=4096 + - BGP identifier aka router id + - removal of loops + - aggregation, ATOMIC_AGGREGATE + - communities + - confederations + - attributes must be sorted! + - re-export of NEXT_HOP attribute + - BGP session over currently down interface + - route flap dampening? + - LOCAL_PREF attribute + - error notification received -> log error + - set TTL to 1 (configurable?) + - consulting IGP for next-hop information? (what if it changes?) + - inter-advertisement delay???! + - normalize (sort) incoming AS-SET's + - maximum length of AS paths + + - expected neighbor AS + - hold time + - idle timer after error: initial value, exponential growth, maximum value + +- address testing macros (ALL_ZEROS) +- all internal tables are in network order (?) +- logging of errors and debug dumps +- filter: logging of dropped routes (?) +- limitation of memory consumption: per-process and total +- alloca +- precedence of all packets (incl. TCP) +- adding of route: clear all bits not covered by masklen +- switch: generate default route only if at least one BGP connection exists + +- route update: new, change, remove +- route recalculation timing + +- CONFIG_TOS +- CONFIG_MULTIPATH + +- reconfiguration without restart of all protocols? +- change of interface address: ??? (down and up?) +- "generate default route" switch for all IGP's + +- RIPv2: + - Route Tag + - limit routing table xfer (frequency, only to neighbors) + - multicast on/off + - remember routes for all neighbors? + +- BGP: + - import of IGP routes (use external route tags from OSPF) + +- Interface: + - RIP metric + - multicast capability flag + - MTU + - OSPF metrics (per-TOS) + +- running protocol on an interface: + - interface is not required to exist + - can specify a wildcard pattern or an interface list + +- preferences: + - directly connected + - static + - OSPF internal, OSPF ext type 1 (comparable metrics), OSPF inter-area + - RIP + - BGP + - OSPF ext type 2 + - sink + +- lib: + - MD5 + +- OSPF: + - Dijkstra: use Fibonacci heaps? + - point-to-point interface with address: advertise as stub network + - static routes: stub networks? + - modes: PtP, PtP-unnumbered, Broadcast, NBMA, point-to-multipoint + - importing of device routes for networks where we don't run OSPF + - tie breaking for equal type 2 ext metrics by using internal (type 1) metric + - SPF tree recalc timing (per-area timers?) + - aggregation: specify network list for each area + - stub area: either no external routes or only default route + - automatic generation of external route tags (RFC1403) -- what about + using the same rule for RIPv2? [shared code?] + +- timers - one-shot and periodic, resolution 1 sec, randomized +- re-configuration: restart of routing protocols (shutdown mode) +- route: originating AS + +- Check incoming packets and log errors!! |