Re: [Isis-wg] Interface IP addresses from IS-IS
Hannes Gredler <hannes@juniper.net> Wed, 12 October 2005 15:03 UTC
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Date: Wed, 12 Oct 2005 17:03:24 +0200
From: Hannes Gredler <hannes@juniper.net>
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To: rup@sce.carleton.ca
Subject: Re: [Isis-wg] Interface IP addresses from IS-IS
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rup@sce.carleton.ca wrote: > Hi guys, > > Does any of the IS-IS packets contains the IP addresses of all the interfaces of > router runnning IS-IS? LSPs (if traffic-engineering is enabled on a link) may contain subTLV 6,8 to the extended IS reach TLV 22. i.e. see below a tcpdump output of an IS-IS LSP: 18:28:54.259841 IS-IS, length 333 L2 LSP, hlen: 27, v: 1, pdu-v: 1, sys-id-len: 6 (0), max-area: 3 (0) lsp-id: 0102.5500.6110.00-00, seq: 0x00000005, lifetime: 1198s chksum: 0x59e3 (correct), PDU length: 333, Flags: [ L1L2 IS ] Area address(es) TLV #1, length: 14 Area address (length: 13): 47.0005.80ff.f800.0000.0108.0001 Protocols supported TLV #129, length: 2 NLPID(s): IPv4 (0xcc), IPv6 (0x8e) Traffic Engineering Router ID TLV #134, length: 4 Traffic Engineering Router ID: 10.255.6.110 IPv4 Interface address(es) TLV #132, length: 4 IPv4 interface address: 10.255.6.110 Hostname TLV #137, length: 8 Hostname: schnapps IS Reachability TLV #2, length: 12 IsNotVirtual IS Neighbor: 0102.5507.0001.00, Default Metric: 10, Internal Extended IS Reachability TLV #22, length: 94 IS Neighbor: 0102.5507.0001.00, Metric: 10, sub-TLVs present (83) IPv4 interface address subTLV #6, length: 4, 10.40.2.1 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ IPv4 neighbor address subTLV #8, length: 4, 10.40.2.2 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Unreserved bandwidth subTLV #11, length: 32 TE-Class 0: 154.520 Mbps TE-Class 1: 116.640 Mbps TE-Class 2: 77.760 Mbps TE-Class 3: 38.880 Mbps TE-Class 4: 155.520 Mbps TE-Class 5: 116.640 Mbps TE-Class 6: 77.760 Mbps TE-Class 7: 38.880 Mbps Reservable link bandwidth subTLV #10, length: 4, 155.520 Mbps Maximum link bandwidth subTLV #9, length: 4, 155.520 Mbps Administrative groups subTLV #3, length: 4, 0x00000000 Bandwidth Constraints (old) subTLV #12, length: 17 Bandwidth Constraints Model ID: Russian dolls (0) Bandwidth constraint CT0: 155.520 Mbps Bandwidth constraint CT1: 116.640 Mbps Bandwidth constraint CT2: 77.760 Mbps Bandwidth constraint CT3: 38.880 Mbps IPv4 Internal Reachability TLV #128, length: 72 IPv4 prefix: 10.255.6.110/32, Distribution: up, Metric: 0, Internal IPv4 prefix: 10.40.2.0/30, Distribution: up, Metric: 10, Internal IPv4 prefix: 10.40.1.0/30, Distribution: up, Metric: 20, Internal IPv4 prefix: 10.40.3.0/30, Distribution: up, Metric: 20, Internal IPv4 prefix: 10.255.70.1/32, Distribution: up, Metric: 10, Internal IPv4 prefix: 10.255.71.212/32, Distribution: up, Metric: 20, Internal Extended IPv4 Reachability TLV #135, length: 54 IPv4 prefix: 10.255.6.110/32, Distribution: up, Metric: 0 IPv4 prefix: 10.40.2.0/30, Distribution: up, Metric: 10 IPv4 prefix: 10.40.1.0/30, Distribution: up, Metric: 20 IPv4 prefix: 10.40.3.0/30, Distribution: up, Metric: 20 IPv4 prefix: 10.255.70.1/32, Distribution: up, Metric: 10 IPv4 prefix: 10.255.71.212/32, Distribution: up, Metric: 20 IPv6 reachability TLV #236, length: 22 IPv6 prefix: abcd::10:255:6:110/128, Distribution: up, Metric: 0, Internal > I looked at TLV type 132, but it requires at least one interface IP address > only, rest are optional. The TLV type 128 can give you the prefix and netmask > but not the exact IP address. TLV 132 is typically used in IIHs - some implementations add also the IP address of the loopback IP adress packeged in TLV 132 in LSPs. _______________________________________________ Isis-wg mailing list Isis-wg@ietf.org https://www1.ietf.org/mailman/listinfo/isis-wg